Nerium oleander

Growing in Pots, Balconies & Indoors

Oleander (Nerium oleander) is a tough, sun-loving flowering shrub, 1-4 m – not a houseplant, but a classic large-container plant for a hot patio or balcony that can be overwintered under cover in cold climates. Every part is highly poisonous.

Quick Details

• Container Size: A large tub, roughly 20-50 L (5-13 gal) (general guide)
• Indoor Suitability: Not a houseplant – too large, sun-hungry and toxic for a room
• Best Spot: Full sun to half shade; loves heat
• Soil & Drainage: Free-draining mix; it tolerates poor soil and drought
• Watering in Pots: Water sparingly to moderately once established; drought-tolerant

Indoors & On the Windowsill

• Houseplant: No – it needs full sun and is far too toxic and large for a living room.
• Windowsill growing: Not suitable as a sill plant.
• Overwintering: A key reason to pot it – in cold climates keep it in its tub and overwinter it in a cool, bright, frost-free place (a porch, garage window or unheated conservatory), kept nearly dry.

On a Balcony or Patio

• Light & wind: Give it the hottest, sunniest spot; it shrugs off heat, drought and wind and thrives on reflected wall warmth. It flowers best baked in full sun.
• Practicalities: A big tub is heavy – use a pot trolley to move it under cover for winter, and site it away from where children or pets pass.

Choosing the Pot, Soil & Long-Term Care

• Pot & drainage: A large tub with strong drainage; Use a pot with strong drainage holes and skip a standing-water saucer to avoid root rot; terracotta breathes and dries out faster, while glazed or plastic pots hold moisture longer.
• Potting mix: Fill with a well-aerated, organic-rich medium – a quality potting mix, or peat/coir blended with perlite or vermiculite for free drainage.
• Feeding: Potted plants use up their soil quickly because watering leaches nutrients away, so feed a little more often than plants in open ground through the growing season.
• Repotting: Pot up or refresh the mix every couple of years and prune to shape after flowering (wear gloves).
• Safety: Extremely poisonous – every part is dangerous if eaten, and the sap and even smoke from burning prunings are harmful. Never grow it where children or pets could reach it, wear gloves to prune, and wash your hands afterwards.

Bloom & Flower Guide

Quick Details

• Bloom Season: Most of the year in warm climates
• Time to First Bloom: Once the shrub is established (evergreen perennial)
• Flower Appearance: Showy flowers 3–6 cm across in white, pink, yellow or red, single to double
• Edibility: ⚠️ Not edible — oleander is highly poisonous in every part; never ingest, and wash hands after handling

Detailed Blooming Overview

Oleander is one of the longest-flowering shrubs for warm, dry gardens, carrying showy 3–6 cm blooms — white, pink, yellow or red, single or double — through most of the year. It is grown purely for those flowers.

Flower Characteristics

• Appearance & habit: Clusters of 3–6 cm five-petalled to double flowers at the branch tips.
• Safety: Every part is highly toxic if eaten; keep well away from children and pets, and don’t burn prunings.

Bloom Care & Pollination

• Pollination: Visited by bees and butterflies, though it sets little seed.