Water
Allow the soil to dry out completely between waterings. Water thoroughly until it drains from the bottom of the pot. Avoid overwatering, as this can lead to root rot.
Reduce watering significantly during the cooler, dormant months of winter.
Safety note: This plant may be toxic to humans and pets. See toxicity details.
Cycas siamensis is a palm-like cycad native to Southeast Asia. It features stiff, pinnate leaves and is a striking ornamental plant for tropical and subtropical gardens.
At-a-glance light, water, soil, and growing conditions from plant data
Full sun to partial shade
75% intensity
Prefers at least 6 hours of direct sunlight daily, but can tolerate some shade.
Allow soil to dry out between waterings
25% intensity
Water deeply, but infrequently. Avoid waterlogged soil.
Well-draining, sandy loam
50% intensity
Warm to hot
75% intensity
Prefers temperatures between 18-30°C. Protect from frost.
Moderate
50% intensity
Feed with a balanced fertilizer during the growing season.
Safety information from plant toxicity data
| Attribute | Value |
|---|---|
| Toxic for humans | Yes 5/5 intensity |
| Toxic for pets | Yes 5/5 intensity |
Seeds and roots are toxic due to the presence of cycasin. Ingestion can cause vomiting, diarrhea, liver damage, and neurological symptoms.
Key traits and growing stats from plant data
Watering, pruning, propagation, and repotting details from plant data
Allow the soil to dry out completely between waterings. Water thoroughly until it drains from the bottom of the pot. Avoid overwatering, as this can lead to root rot.
Reduce watering significantly during the cooler, dormant months of winter.
Pruning is generally not required for aesthetic reasons. Remove only old, brown, or dead fronds by cutting them close to the trunk.
Avoid removing healthy green fronds, as they are essential for the plant's energy production and overall health.
Propagation is typically done by seed, which can be slow and requires specific conditions. Offsets or suckers that form at the base of established plants can also be carefully separated and planted, though this is less common and can be challenging.
Repot mature plants infrequently, perhaps every 3-5 years, when they become root-bound. Use a well-draining potting mix. Choose a pot only slightly larger than the current one. Repot in spring before new growth begins.
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Monthly activity intensity for bloom and fruit across both hemispheres.
Flowering & fruiting calendar
Flowering & fruiting calendar
Photos of Cycad (Cycas siamensis)
Where Cycad (Cycas siamensis) is found

Density
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Common names and botanical synonyms
Botanical classification
| Rank | Name |
|---|---|
| Kingdom | Plantae |
| Division | Tracheophyta |
| Class | Cycadopsida |
| Order | Cycadales |
| Family | Cycadaceae |
| Genus | Cycas |
| Species | Cycas siamensis |
Similar in genus Cycas
Answers based on plant encyclopedia data