Sedum dasyphyllum

Plant Profile & Key Characteristics

Overview: Corsican stonecrop (Sedum dasyphyllum) is a low, evergreen, drought-tolerant succulent groundcover, 5-10 cm (2-4 in) tall, grown for its fleshy foliage and star-like flower clusters. This moderate-growing perennial is used mainly as ornamental groundcover in rock gardens, containers and green roofs (hardiness zone 5-9 (10a with care)).

Quick Specifications

Specification	Attribute
Plant Type / Life Cycle	Perennial (evergreen succulent, groundcover)
Foliage Type	Evergreen (fleshy, succulent)
Mature Size	5-10 cm (2-4 in), spreading
Growth Rate	Moderate
Root System	Shallow, fibrous
Toxicity	Toxic to cats
Hardiness	USDA zone 5-9 (10a with care)

Growth Form & Structure

• Height & Spread: Reaches 5-10 cm (2-4 in); a low, drought-tolerant groundcover that also does well in shallow, wide containers and can be grown indoors as a houseplant.
• Growth Habit & Form: Low, mat- or cushion-forming succulent subshrub that spreads into a dense evergreen groundcover.

Anatomy & Physical Features

• Leaves & Foliage: Tiny, rounded, blue-green to grey fleshy leaves forming a dense, low carpet.
• Flower Characteristics: White, five-petalled star flowers in clusters on short stems.

Primary Uses & Landscape Value

• Functional & Ornamental Roles: Ornamental groundcover, rock-garden, green-roof and container plant, houseplant, trough and rock-garden groundcover.

Care Guide: Planting, Soil & Watering

Overview: Sedum dasyphyllum (Corsican stonecrop) is a hardy, drought-tolerant succulent that thrives in bright light and gritty, sharply draining soil. It stores water in its fleshy leaves, so it needs only occasional watering and quickly rots in heavy, wet ground.

Quick Care Requirements

Requirement	Ideal Condition
Planting Season	Spring in zones 5–7; spring to summer in zones 8–9; spring to autumn zone 10a
Growth Rate	Moderate
Soil Type	Light, sandy, well-draining soil — a cactus/succulent mix or soil opened up with grit
Water Need	Low to Moderate — let the soil dry out between waterings

Planting & Establishment

• Best Planting Season: Set out plants in the warmth of spring so the roots settle before winter; in the mildest zones the window stretches further (spring in zones 5–7; spring to summer in zones 8–9; spring to autumn zone 10a). In cold-winter areas grow it in containers that can be moved under cover.
• How to Plant:
  • Hole Preparation: Dig a shallow hole just wide and deep enough for the small root ball — these succulents are shallow-rooted and resent sitting in a deep, water-holding pocket.
  • Soil Amendments: Mix coarse sand, grit or perlite into the bed to sharpen drainage; aim for a lean, airy soil rather than a rich, moisture-retentive one.
  • Planting Depth: Set the crown level with the soil surface so the fleshy stems and leaves rest on top — never bury them, which invites rot.
• Growth Speed & Expectations: Expect moderate growth; as a spreading groundcover it knits together steadily into a low mat rather than shooting upward.

Soil, Watering & Drainage Care

• Soil Mix & Drainage Needs: Give it a light, well-aerated mix; in pots use a shallow, wide container of free-draining cactus/succulent soil with ample drainage holes. Waterlogged soil is the single biggest threat, quickly rotting the roots and stems.
• Watering Schedule & Technique:
  • Young / Newly Planted: Water lightly after planting and then only once the soil has dried, just enough to help new roots settle — overwatering now is the main cause of failure.
  • Established: Water deeply but infrequently, always letting the soil dry out completely first; established plants shrug off real drought.
  • Seasonal Adjustments: Cut watering back sharply in winter while the plant rests, and water a little more often only during prolonged summer heat.

Climate, Light & Hardiness

Corsican stonecrop is a small-growing Mediterranean succulent that adapts equally well to outdoor rock gardens and bright indoor spaces. It thrives in full sun to shade - an unusually broad light tolerance for a sedum - and has solid cold hardiness for its Mediterranean origin.

Quick Climate Specifications

Climate Zones	Temperate, Mediterranean, subtropical; also grown as a houseplant
USDA Hardiness Zones	5–9, with the right care into 10a
Optimal Temp Range	Approximately 15–27°C (59–80°F) outdoors; comfortable indoor room temperature is fine year-round
Approx. Survival Minimum	Established outdoor plants in zone 5 typically endure winter minimums around −23°C to −29°C (−10°F to −20°F)
Frost Tolerance	Moderate–High
Light Conditions	Full Sun / Half Shade / Full Shade
Wind Tolerance	High

Sunlight & Light Exposure

Optimal Light Setup

Tolerates the widest light range of the stonecrops in this group, from full sun to full shade; indoors, a bright spot near a window gives the best compact growth and gray-green color.

Direct Sun Requirement

Direct sun is welcomed but, unusually for a sedum, not essential - it also performs in shadier corners of the garden.

Shade & Heat Management

Its shade tolerance makes it useful in spots too dim for most sun-loving succulents; heat is well tolerated given adequate drainage.

Best Exposure / Orientation

Suitable for rock gardens, wall crevices, or a bright-to-moderate indoor windowsill.

Temperature Extremes & Hardiness

USDA Hardiness & Regional Limits

Outdoors it is hardy in zones 5–9, extending into 10a with attentive care; in colder climates it can instead be grown year-round as a houseplant.

Cold Damage & Winter Protection

Foliage may take on a grayer or reddish cast in cold weather; a sheltered, well-drained site reduces winter losses at the cold edge of its range.

Frost Sensitivity

Reasonably frost tolerant once established outdoors; container and indoor plants should be brought in or protected before hard frost.

Extreme Heat Tolerance

Handles Mediterranean summer heat well.

Wind, Humidity & Microclimate

Humidity Preferences

Outdoors it prefers drier, well-ventilated air; indoors it adapts to normal household humidity without special measures.

Dry-Air Tolerance

High, as expected for a drought-tolerant succulent.

Wind Tolerance

Its low habit tolerates open, breezy outdoor sites well.

Microclimate Recommendations

Where winters are too cold for reliable outdoor survival, a bright indoor or greenhouse-adjacent spot lets it thrive year-round.

Growing in Pots, Balconies & Indoors

Sedum dasyphyllum (Sedum dasyphyllum) is a low, mat-forming succulent, 5-10 cm (2-4 in) tall. The grower notes it can double as a houseplant in bright light. In pots it is easy and forgiving – a shallow, gritty container on a sunny sill, balcony or patio is all it asks.

Quick Details

• Container Size: Shallow and wide; minimum 5-8 L, only about 70-150% larger than the root ball
• Indoor Suitability: Can be grown as a houseplant in the brightest possible light
• Best Spot: Full sun to part shade – the brightest spot available
• Soil & Drainage: Fast-draining cactus/gritty mix; never soggy
• Watering in Pots: Sparingly – let the mix dry out between waterings; overwatering is the main risk

Indoors & On the Windowsill

• A houseplant option: The grower confirms this stonecrop can be grown as a houseplant – give it the single brightest spot in the home.
• Windowsill: A sunny, south- or west-facing sill with several hours of direct sun keeps the rosettes tight; stretched, pale growth means it needs more light.
• Overwintering: Hardy outdoors, but a favourite pot can spend a harsh winter on a cool, bright indoor sill.

On a Balcony or Patio

• Light & heat: Ideal for a hot, sunny balcony – it shrugs off reflected heat from walls and paving. Give it the brightest spot and it will colour up beautifully.
• Rain & drainage: In prolonged wet weather move pots under cover; combined with cold, standing water is what kills these succulents, not drought.

Choosing the Pot, Soil & Long-Term Care

• Pot & drainage: A shallow, wide pot with strong drainage holes; skip a standing water saucer to avoid root rot. Terracotta breathes and dries fast (good for succulents), while glazed or plastic holds moisture longer.
• Potting mix: A gritty, free-draining blend – cactus mix or potting mix cut with sharp sand, perlite and a topping of gravel or lava rock.
• Feeding: Succulents need very little; a weak feed once or twice in the growing season is ample in a pot.
• Refreshing the mix: Container mix loses its drainage after a few years – replace it and pot on as the clump spreads.

Grower’s Container Tip

• Shallow and wide: pick a pot only about 70-150% larger than the root ball. A depth of 10-15 cm (4-6 in) is plenty – going deeper adds nothing. A minimum of 5-8 L works, but bigger is better.
• To keep the plant compact you can trim the roots and let them regrow into fresh space.
• Drainage is everything: use a free-draining potting mix, cactus mix or sandy soil, and add coarse grit – gravel, lava rock or pebbles. After a few years the mix stops draining well, so replace it with fresh mix.

Fertilizing & Feeding

A light feeder: this small, gray-green groundcover succulent – grown outdoors or as a houseplant – needs only minimal fertilizer, and rich feeding tends to soften its compact, fleshy foliage.

Quick Fertilizing Specs

Feeding Level	Light feeder
Main Nutrient Priority	A light, low-nitrogen feed rather than a rich, nitrogen-heavy program
Best Feeding Period	Sparingly during the active warm-season growth period, whether grown outdoors or indoors
Organic Options	A thin layer of compost worked into the sandy, well-drained soil this plant favors outdoors
Micronutrients	Rarely needed for this tough groundcover; correct a specific deficiency only when actually diagnosed
Soil pH	Tolerates a wide range of soil pH; sharp drainage matters far more than a particular pH
Reduce/Stop Feeding	Stop feeding as growth slows going into the cooler, lower-light part of the year

Feeding by Growth Stage

Active warm-season growth

Support this low, spreading groundcover’s fine gray-green foliage and small white star flowers without pushing soft, watery growth.

Nutrient direction	A light, low-nitrogen feed at most; this succulent is adapted to lean soil and tolerates full shade to full sun without needing rich nutrition.
Timing	During the warm active growth period leading up to summer bloom.
Frequency	Feeding is rarely needed; a single light application during active growth is plenty, and even less if grown indoors in lower light.
Fertilizer types	A light, low-nitrogen succulent or cactus fertilizer used sparingly, A thin top-dressing of compost worked into well-drained, sandy soil for outdoor plantings
Precautions	Favor sharp drainage over feeding, and feed even more sparingly on indoor, lower-light specimens, which use nutrients more slowly than outdoor plants in full sun.

Cool-season or low-light rest

Let this evergreen succulent rest through the cooler outdoor season or through periods of reduced indoor light.

Nutrient direction	None – withhold fertilizer while growth is minimal in cool or low-light conditions.
Timing	Through the cooler, slow-growth months outdoors, or through shorter, dimmer days indoors.
Frequency	No feeding at this stage.
Fertilizer types	No feeding at this stage – resume only lightly once active growth returns
Precautions	Do not fertilize a resting or low-light succulent; unused nutrients can accumulate in the soil and increase the risk of rot.

Nutrient Deficiency Signs & Corrections

The base of the mat turns mushy, dark, and translucent, and stems detach or collapse easily.

Possible causes	waterlogged or heavy, slow-draining soil or potting mix, overwatering, especially in cool weather or low light, over-rich feeding held against the crown
Appears first on	the stem base and lowest leaves
What to check	soil or potting mix drainage and moisture, recent watering frequency, recent feeding near the crown
Possible correction	Improve drainage, let the soil dry fully between watering, and hold off on feeding until new healthy growth resumes.

Stems stretch and pale, with wider gaps between leaves and an overall thin, leggy look.

Possible causes	insufficient light, especially indoors or in deep shade, very low soil fertility over a long period, old, spent potting mix in containers
Appears first on	new growth at the stem tips
What to check	hours and intensity of light received, how long it has been since any feeding or soil refresh, age and condition of the potting mix, if containerized
Possible correction	Move to brighter light first, since stretching is usually a light issue, then apply only a light, low-nitrogen feed if soil fertility is also genuinely low.

Leaf tips brown or shrivel and growth stalls even with regular watering, particularly in pots.

Possible causes	mineral or fertilizer salt buildup in the potting mix, infrequent leaching of the container, over-fertilizing relative to this plant’s very light needs
Appears first on	leaf tips and margins
What to check	visible salt crust on the soil surface or pot rim, how often the container is watered through until it drains, recent fertilizing frequency
Possible correction	Flush the container thoroughly with water to leach built-up salts and cut back on how often it is fed.

Pruning, Training & Seasonal Maintenance

Sedum dasyphyllum (Corsican stonecrop) is the smallest and most delicate species in this group, forming a fine, low mat only 5–10cm tall. It needs the lightest touch of the Sedum species covered here – usually just removing an occasional spent flower stem or dead rosette. Grown outdoors it stays compact in full sun; grown indoors as a houseplant (this species tolerates both), lower indoor light can cause stretched, leggy growth reaching toward a window, which benefits from pinching back more actively than the same plant would need outdoors.

Quick Pruning & Maintenance Specs

Pruning Tolerance	Low
Primary Pruning Window	Winter tidy of spent bloom stems
Secondary Maintenance Window	Occasional pinching of stretched growth, mainly relevant indoors
Typical Frequency	Infrequent – spot tidying as needed
Main Objective	Remove spent flower stems; control legginess in low-light (indoor) conditions
Young Plant Priority	None – let the fine mat establish
Mature Plant Priority	Pinch stretched stems if grown indoors or in shade
Best Tool Type	Precision snips
Avoid Heavy Pruning During	Prolonged wet weather

Pruning by Plant Age & Size

Newly Established

No pruning – allow the fine mat to establish.

Young / Formative

No training system applies. If grown indoors under low light, pinch back any stretched, leggy growth early to keep the mat dense rather than sparse.

Mature / Established

Occasional light tidy of spent bloom stems and old rosettes; indoor plants may need more frequent pinching than outdoor, full-sun plants of the same species.

Seasonal Pruning Schedule

Dormant/Winter

Objective: light annual tidy. Remove: spent bloom stems, dead rosettes. Do not remove: healthy mat growth – this species is delicate and does not need or benefit from more than minimal cutting.

Special Growth to Remove

• Spent flower stems.
• Dead or shriveled rosettes.
• Stretched, leggy indoor growth reaching for light (outdoor, full-sun plants rarely need this).

Container & Small-Space Pruning

Well suited to small pots and indoor growing given this species’ houseplant tolerance. Indoors, rotate the pot toward light and pinch back stretched growth rather than relying on pruning alone to keep it compact; outdoors in a shallow container it stays naturally tight with little intervention.

Tools

• Precision snips – the only tool this fine, small-leaved species needs.

Tool Hygiene & Disease Risk

Routine, but keep blades clean given this species’ small, delicate, moisture-retentive tissue, which is vulnerable to rot from a dirty cut.

Cut Placement & Technique

Pinch or snip cleanly just above a healthy rosette; avoid crushing the fine stems.

Heavy Pruning & Rejuvenation

Not applicable – this species is too fine and low-growing to need or tolerate a hard renewal cut. If a patch thins out, propagate fresh material from leaf or stem cuttings rather than cutting back existing growth.

Post-Pruning Care

Water sparingly after any trim; avoid overwatering, particularly indoors where drainage and airflow are more limited than outdoors.

Common Pruning Mistakes

• Letting indoor plants stretch for months before finally pinching them back, resulting in a sparse, bare-stemmed look.
• Overwatering after a light trim.
• Treating this delicate species like a larger, tougher Sedum and cutting more heavily than it needs.

When NOT to Prune

• During prolonged wet weather.
• Right before a hard frost at the colder edge of its zone 5–9/10a range.

Recommended Tools (by task)

• precision_snips – the sole tool needed for this small, delicate species, indoors or out.

Propagation Guide

Sedum dasyphyllum (Corsican stonecrop) is small and low-growing, and roots readily from leaf or stem cuttings, which is faster and easier than starting from seed. Vegetative propagation is not required but is the recommended everyday method, and this plant’s small, houseplant-friendly size also makes it convenient to propagate on a windowsill; propagation is Easy overall.

Quick Propagation Specs

Best Propagation Method	Leaf or stem cuttings
Alternative Methods	Ground layering (bending a stem over and covering it with soil); seed
Propagation Difficulty	Easy
Vegetative True-to-Type	Yes
Best Propagation Season	Spring through summer outdoors; achievable year-round indoors given this species can be grown as a houseplant
Cutting Rooting Time	Typically a few weeks once callused and set in soil

Growing from Seed

Seed is a workable but slower alternative to cuttings; sow into light, sandy, well-drained soil (matching this plant’s preferred soil mix) and keep barely moist, taking care not to overwater this small succulent’s shallow root system.

Leaf & Root Cuttings

Cutting Type

Whole leaves or short stem pieces; cutting at the base of the leaf works best, though mid-leaf or stem cuttings also succeed.

Cutting Preparation

Let cuttings heal and dry slightly in a shaded spot for a few days before inserting into soil, to help prevent rot.

Rooting Setup

Insert the callused leaf or stem into soil and keep it moist without overwatering; good drainage matters throughout rooting, indoors or out.

Air & Ground Layering

An easier alternative to cuttings: bend a stem over and cover part of it with soil, keeping the buried section lightly moist until roots form, then sever and transplant.

Bloom & Flower Guide

Quick Details

• Bloom Season: Summer
• Flower Appearance: White, five-petalled star flowers carried in clusters on short stems
• Edibility: Grown as an ornamental groundcover, not for eating

Detailed Blooming Overview

Corsican stonecrop flowers in summer, its small white stars rising above tight cushions of blue-green, fleshy leaves. It is a low, drought-tolerant carpeter, and the delicate bloom softens the plant’s beaded look.

Flower Characteristics

• White, star-shaped flowers with five petals.
• Held in small clusters on stems above the foliage.
• Nectar-rich – visited by bees and other small pollinators.

Bloom Care & Thinning

• Managing the bloom: Shear off the spent flower stems once flowering ends to keep the cushion neat.
• Pollination: The open flowers are easily worked by bees and hoverflies.

Pests, Diseases & Troubleshooting

Overview: Corsican stonecrop is a diminutive Mediterranean mat-former with tiny, tightly packed powder-blue beads, hardy but delicate in scale. Like all stonecrops, Sedum dasyphyllum is far more often harmed by cultivation mistakes-above all overwatering-than by any pest. The insects it does attract (mealybugs and aphids under cover, slugs and snails outdoors) are few and easily managed by hand or with gentle organic sprays. Grow it hard in sharply drained gritty soil with strong light, water only when the soil is dry, and most problems never begin.

Quick Troubleshooting Overview

Issue / Pest	Main Symptom	Primary Solution
Mealybugs	White cottony tufts tucked into leaf axils and rosette centres, sticky honeydew and sooty mould	Dab with alcohol, rinse, then insecticidal soap or neem
Aphids	Clusters of soft green/black insects on new growth and flower stems, distortion and sticky sap	Blast with water, insecticidal soap, encourage ladybirds
Slugs & snails	Ragged holes and slime trails over the fleshy leaves, worst in damp weather	Hand-pick after dark, grit/copper barriers, iron-phosphate bait
Root & stem rot	Blackened, mushy, translucent stems that collapse at the base	Withhold water, improve drainage, cut back to firm tissue and re-root
Etiolation	Stems stretch pale and floppy with wide gaps between leaves	Move to much brighter light; behead and re-root compact tips
Sedum rust	Rusty-orange pustules on undersides of leaves and stems	Remove affected growth, improve airflow, sulphur if severe

Common Pests & Management

• Mealybugs (Planococcus citri / Pseudococcus spp.):
  • Symptoms: Slow-moving, soft insects coated in white waxy fluff, hiding deep in leaf axils, rosette centres and among trailing stems. They excrete sticky honeydew that turns black with sooty mould; heavy infestations stunt and yellow the plant. Do not mistake the cottony masses for the natural waxy bloom on the leaves.
  • Prevention & Control: Inspect new plants before introducing them and isolate any that are infested. Touch each colony with a cotton bud dipped in isopropyl alcohol, then rinse. For wider outbreaks spray insecticidal soap or neem oil, wetting the hidden crevices, and repeat weekly until clear. A bad potted infestation is best cured by unpotting, washing the roots (root mealybugs hide there too) and repotting into fresh gritty mix.
• Aphids (Aphis sedi and other Aphis spp.):
  • Symptoms: Dense clusters of soft green, grey or black insects on tender new shoots and especially on the flower stalks, causing curling and sticky honeydew. Aphis sedi is the stonecrop specialist and swarms flowering heads.
  • Prevention & Control: Knock them off with a firm jet of water, repeated every few days. Encourage ladybirds, lacewings and hoverflies, which clear light infestations on their own. If they persist, an insecticidal soap or a light neem spray in the cool of evening works well; avoid spraying open flowers to protect pollinators.
• Slugs & Snails (Deroceras reticulatum, Cornu aspersum):
  • Symptoms: Irregular holes chewed in the plump leaves and stems, tender new mat growth grazed away, and tell-tale silvery slime trails; damage appears overnight and in wet spells.
  • Prevention & Control: Keep the crown dry and the surrounding ground open. Hand-pick after dark by torchlight, set beer traps, and ring vulnerable plants with sharp grit, crushed shell or copper tape. Where pressure is high, scatter iron-phosphate pellets, which are safe around pets and wildlife.
• Vine weevil (Otiorhynchus sulcatus):
  • Symptoms: Adults notch neat bites from leaf margins at night; the real damage is done below ground by fat, legless, C-shaped white grubs that devour roots, causing sudden wilting and collapse of an otherwise healthy plant-most serious in containers.
  • Prevention & Control: Check the rootball of new plants. Water in a drench of beneficial nematodes (Steinernema/Heterorhabditis) into moist, warm compost to kill the grubs; repot survivors into fresh mix and remove any adults found at night.

Diseases & Fungal Issues

• Crown, stem & root rot (Pythium, Phytophthora, Fusarium, Rhizoctonia):
  • Symptoms: By far the commonest killer of stonecrops. Stems and the base of the plant turn black, soft, translucent and foul-smelling, then collapse; roots are brown and mushy. It follows soggy soil, buried crowns or cold wet conditions.
  • Treatment & Management: Prevention is everything-use a fast-draining gritty mix, pots with drainage holes, and water only when dry, never letting the plant sit wet. If rot appears, cut cleanly back into firm green tissue, let the cutting callus, and re-root it; discard badly rotted plants and the contaminated soil.
• Botrytis / grey mould (Botrytis cinerea):
  • Symptoms: Fuzzy grey-brown mould on leaves, stems and faded flowers in cool, damp, crowded conditions; affected tissue rots and drops.
  • Treatment & Management: Improve air movement, avoid overhead watering, and remove dead leaves and spent flower heads promptly. Thin congested growth; a copper or biological fungicide helps only if the underlying damp is corrected.
• Sedum rust (Puccinia spp.):
  • Symptoms: Powdery rusty-orange to brown pustules on the undersides of leaves and on stems, with yellow blotches above; heavy attacks weaken and disfigure the plant.
  • Treatment & Management: Pick off and destroy infected leaves at first sign, space plants for good airflow and keep foliage dry. Persistent cases respond to a sulphur or other organic fungicide applied to protect new growth.
• Powdery mildew (Erysiphe/Golovinomyces spp.):
  • Symptoms: A less frequent, white powdery film on leaves and stems in warm, humid, still air, sometimes distorting new growth.
  • Treatment & Management: Increase spacing and airflow, remove affected parts, and treat if needed with a potassium-bicarbonate or sulphur spray.

Growing Difficulties & Abiotic Problems

• Overwatering & waterlogging:
  • Cause & Symptoms: The single most common problem-leaves and stems turn yellow, translucent, soft and mushy, and the plant rots from the base. Caused by too-frequent watering, water-retentive soil or pots without drainage.
  • Correction Strategy: Let the soil dry fully between waterings, switch to a gritty free-draining mix, and always use a pot that drains. When in doubt, water less-a stonecrop recovers from drought far more readily than from rot.
• Etiolation (stretching for light):
  • Cause & Symptoms: In too little light the stems elongate, grow pale, and the leaves space out and point down, losing the tight compact form and any bright colour.
  • Correction Strategy: Move to the brightest position available or add a grow light. Stretched growth will not re-compact, so behead the plant and re-root the tidy tips for a fresh, dense start.
• Rot from overwatering and humidity:
  • Cause & Symptoms: Its tiny congested leaves trap moisture, so overhead watering, humidity or poor airflow quickly cause blackening rot and grey mould among the beads.
  • Correction Strategy: Water at the base only, give it the sharpest drainage and full airflow, and keep the foliage dry; it thrives on neglect in gritty, sunny spots.
• Sunburn / scorch:
  • Cause & Symptoms: A plant moved abruptly from shade or indoors into strong summer sun develops bleached white or brown scabby patches on the most exposed leaves.
  • Correction Strategy: Harden it off over one to two weeks, increasing sun gradually. Scarred leaves will not heal but new growth adapts; provide light afternoon shade in the hottest, driest climates.

What Helps – Products & Tools

For this stonecrop keep the toolkit simple and gentle: isopropyl alcohol on a cotton bud for spot-treating mealybugs, insecticidal soap and neem oil for aphids, scale and mites, and-outdoors-iron-phosphate slug pellets, copper barrier tape or sharp grit against slugs and snails. Beneficial nematodes deal with vine weevil grubs in pots, sulphur or potassium-bicarbonate spray checks rust and mildew, and a bag of horticultural grit or pumice is the best long-term insurance against the rot that causes most losses.