Cassia
Also known as: Cassia · Shower Tree · Pink Shower · Golden Shower
4 types of cassia
Dwarf Apple Blossom Tree
N/Aalso: Cassia bakeriana, Pink Shower Tree, Wishing Tree
Small to medium tree with pink apple-blossom-like flowers.
Gold Medallion Tree
N/Aalso: Cassia leptophylla
Bright yellow medallion-shaped flowers on a medium-sized tree.
Golden Shower
N/Aalso: Cassia fistula
National tree of Thailand; spectacular long golden flower chains.
Horse Cassia
N/Aalso: Cassia grandis, Pink Shower Tree
Large tree with pink shower-like bloom clusters.
When & where
Germination
Spacing & depth
How to plant
Nick or soak seed in hot water 24 hours to break the hard coat. Sow in well-drained mix, keep warm and moist. Grow on in deep pots before transplanting to a sunny, frost-free site.
Pre-sow treatment
Scarify by nicking or pour near-boiling water over seed and soak 24 hours.
Grower's tip
Showy tropical trees with masses of pink, yellow, or gold blooms. Needs excellent drainage and protection from frost.
Woody plant facts
Soil preferences
Deep, well-drained native soil. Avoid amending the planting hole heavily — roots should learn to grow into the surrounding earth.
5.5–7.5 depending on species (conifers lean acidic; most hardwoods neutral).
Top-dress with compost and mulch in a wide ring; don't backfill with pure compost.
Watering
Deep soak weekly the first two years while roots establish; taper once the tree self-supports.
Slow trickle at the drip line, not the trunk. A 5-gal bucket with a pinhole is ideal.
Overwatered: yellowing, root rot, mushroom collar. Underwatered: leaf scorch, early leaf drop.
Prefers top-watering — Top-water only — deep slow soak at the drip line, never at the trunk. Bottom-watering is only for tree seedlings in nursery pots (shallow tray 15 min). Established trees always get watered from above onto the soil.
Temperature tolerance
Broad — most species tolerate 40–90°F once established
Down to species-rated USDA zone minimum
Hardy once established; young seedlings need protection their first winter.
Special germination requirements
Most temperate tree seed needs cold stratification (30–120+ days at 34–41°F) — see each species entry for the exact time.
Container growing
Possible with the right cultivar
Deep tree pots (root trainers) for the first 1–2 seasons; permanent site required for full growth.
Only dwarf, patio, or bonsai forms live long-term in containers.
Detailed harvesting
Not applicable for ornamental/timber trees. Nut and fruit species — pick when they drop naturally.
Post-harvest storage & preservation
Nuts: keep damp and cool, sow promptly. Winged/coned seed: dry, cool, dark in a sealed jar.
Culinary, medicinal & other uses
Shade, windbreak, wildlife habitat, timber, ornament, and long-term carbon storage.
Medicinal or traditional uses are shared for interest only — this is not medical advice. Consult a qualified professional before using any plant medicinally.
Seed saving
Wind- or insect-pollinated; seedlings rarely match the parent exactly (especially named cultivars — those must be grafted or cutting-grown).
Not practical for trees. Expect variation.
Collect fully ripe seed in fall, clean, dry or keep damp per species, then cold-stratify before spring sowing.
Your zone's planting calendar
Pick your USDA hardiness zone and we'll estimate the key dates for cassia in your area. These are regional averages — always check your own last-frost forecast before sowing.
My Cassia notes
Cassia seeds on hand
Track packets and loose seeds you already have. Private to your account.
Par level — leave at 0 for no alert. Anything below par shows on Seed Starting and your shopping list.
Order more seeds
Running low? Reorder from one of these seed stores.
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