Aglaonema costatum

Growing in Pots, Balconies & Indoors

Aglaonema costatum is a classic Chinese-evergreen foliage plant (about 30-90 cm / 12-36 in) and one of the best, most tolerant houseplants there is. It actually prefers shade and copes with low indoor light, so it thrives well away from a window where fussier plants fail.

Quick Details

• Container Size: A pot sized to the root ball; pot up a size when it fills out
• Indoor Suitability: Excellent low-light houseplant – happy deep in a room
• Best Spot: Full shade to bright indirect light; keep out of hot direct sun
• Soil & Drainage: Rich, well-drained potting mix – peat/coir with perlite
• Watering in Pots: Keep evenly moist in growth; let the surface dry slightly between waterings and never leave it waterlogged

Indoors & On the Windowsill

• Houseplant use: The grower confirms it as a houseplant, and it is a standout – it tolerates full shade and low light, so it suits offices and darker corners as well as bright rooms (out of direct sun).
• Care: Keep it warm (it dislikes cold drafts and chilling), maintain moderate humidity, and water when the surface just dries.
• Overwintering: A permanent indoor plant in cold climates – simply keep it warm and away from cold windows and heaters.
• Safety: Aglaonema contains calcium-oxalate crystals and is toxic if chewed, irritating mouth and skin – keep away from children and pets.

On a Balcony or Patio

• Light & shelter: Only for warm, frost-free, shaded balconies or patios – it needs protection from direct sun, wind and any chill; bring it in when nights turn cool.
• Practicalities: Water more often in summer warmth, but keep the pot freely draining.

Choosing the Pot, Soil & Long-Term Care

• Pot & drainage: A pot matched to the root ball with strong drainage holes; skip a standing-water saucer to avoid root rot. Plastic or glazed pots hold the steady moisture it likes better than terracotta.
• Potting mix: Rich but well-aerated – peat or coir with perlite, or a good potting mix.
• Feeding: Potted plants exhaust and leach nutrients faster than those in the ground, so feed lightly during active growth – more often than you would in open soil.
• Repotting: Refresh the mix and pot up every couple of years, lightly trimming roots and top growth on perennials to keep them in scale with the pot.

Bloom & Flower Guide

Quick Details

• Bloom Season: Spring and summer
• Flower Appearance: A small white spathe wrapped around a green spadix, looking a little like a slim ice pop on a stalk
• Edibility: Not edible. Like other aroids, all parts contain calcium oxalate crystals that irritate the mouth and skin.

Detailed Blooming Overview

As an aroid, Aglaonema costatum does not bear a conventional petalled flower. Instead it produces the family’s typical bloom: a pale spathe (a modified leaf) cupped around a green spadix carrying the tiny true flowers. It is modest rather than showy, appearing in spring and summer on plants grown mainly for their patterned foliage.

Flower Characteristics

• A white spathe enclosing a green spadix.
• Slim, upright form resembling a small ice pop.
• Not fragrant and not showy.

Bloom Care & Thinning

• Managing the bloom: Since the plant is grown for its leaves, many growers snip off the spathes as they form so energy goes into the foliage.
• Safety: The sap is irritating; wear gloves when removing spent flowers and keep the plant away from pets and children.