Aglaonema costatum
Aglaonema costatum (Spotted Chinese Evergreen) Care Guide
Featured photoaglaonema-costatum.jpgAglaonema costatum, sold as Spotted Chinese Evergreen, is one of the most forgiving Asian aroids in cultivation. It is a low-growing species from Indochina with dark green leaves marked by white midribs and irregular spots, often used as a parent for modern variegated cultivars. It tolerates lower light than most patterned houseplants, accepts ordinary indoor humidity, and bounces back from missed waterings, which is why Aglaonema is a staple of office and low-light rooms.
Care facts at a glance
- Light
- Low light
- Water
- Water when the top 3 to 4 cm of mix has dried.
- Humidity
- 40–60 %
- Temperature
- 18–27 °C
- Soil
- Standard houseplant mix with added perlite for drainage.
- Toxicity
- Mildly toxic if ingested. Sap contains calcium oxalate crystals that can irritate the mouth and throat. (humans) · Toxic to cats and dogs per ASPCA. Ingestion can cause oral irritation, drooling, and vomiting. (pets)
- Origin
- Tropical and subtropical forests of Asia and New Guinea.
- Mature size
- 30 to 90 cm tall, similar spread.
Overview
Aglaonema costatum is one of about 25 species in the genus Aglaonema, all native to Asian and New Guinean understorey forests. It is a low-growing species from Indochina with dark green leaves marked by white midribs and irregular spots, often used as a parent for modern variegated cultivars. The patterned-foliage species in cultivation today are mostly hybrids, but the wild parent species remain in collections.
Care Priorities
- Tolerates low to medium indirect light; brighter light deepens variegation.
- Water when the top 3 to 4 cm of soil dries.
- Average household humidity (40 to 60 percent) is fine.
- Keep above 16 °C — Aglaonema is cold-sensitive and leaves blacken below 13 °C.
- Wipe leaves occasionally to keep stomata clear and pattern visible.
Common Problems
Yellow lower leaves usually indicate overwatering. Brown leaf tips suggest cold drafts, dry air, or fluoride-heavy tap water. Sticky residue on leaves is a sign of mealybugs or scale on the stem.
Sources & further reading (3)
- encyclopedia — accessed 2026-04-28
- botanical-garden — accessed 2026-04-28
- toxicity-database — accessed 2026-04-28
Frequently asked questions
Why does my Aglaonema costatum stay so short?
A. costatum is naturally a small, ground-hugging species rarely exceeding 30 cm. It will not grow tall like the hybrid 'Silver Bay' or 'Maria' types — that's a feature, not a problem.
Is Aglaonema safe for pets?
No — all Aglaonema contain calcium oxalate crystals and are listed as toxic to cats and dogs by the ASPCA. Keep out of reach of pets that chew leaves.
How often should I repot?
Aglaonema is slow-growing and prefers to be slightly root-bound. Repot every 2 to 3 years in spring, sizing up only one pot diameter at a time.
