Castanospermum (Lucky Bean) Pruning for Bonsai-Style Growth

Question

Just purchased for dorm—3 in 5" pot, ~1 ft tall. Future reference: increase pot size when soil dries too fast (<3 days). Can I clip leaves/branches to avoid transplanting? How often and how?

Answer

Hi Silvio, Lucky Bean (Castanospermum) is often used/sold as bonsai—potted in shallow dishes, kept pruned/miniaturized to stay in small dish indefinitely. Yours may be in shallow dish. This plant can stay in same pot virtually forever if pruned regularly.

New growth emerges on any healthy stem just below pruning cut. Prune 12" stem to 2" → new growth at 2" height. You decide stem height and where new growth emerges. With proper light/water, prune as much/often as you like. Best to prune back hard and frequently.

Pruning rarely reduces watering frequency unless roots also pruned. Suggest not root pruning—just water every 2-3 days as needed. For serious bonsai, buy a bonsai book detailing root pruning and permanent miniaturization.

I've written a bonsai article I'll email free to anyone requesting at wcreed@HorticulturalHelp.com.

Will Creed, Interior Landscaper
Horticultural Help, NYC