root rot on Epiphyllum Oxypetalum
Quick answer
If your Epiphyllum Oxypetalum has root rot, the most likely cause is: Clive Innes's 1977 Complete Handbook of Cacti and Succulents places black rot among 'Stapelias and epiphytic cacti' — the very growth-form category that Epiphyllum oxypetalum belongs to (the book's own etymology gloss names it 'a cactus that roots on trees, with modified branches that look like leaves'). The blackening shows at or just below soil level and is associated with a high-nitrogen soil; the related basal-stem rot form is triggered by foot damage, cold, or excessive watering in the compost.
Start here:
- 1. Unpot the plant, cut away all blackened or soft basal tissue, dust the cut surfaces with sulphur powder, and allow the cuttings to callus before re-rooting into a fresh, lower-nitrogen, more porous compost.
- 2. Re-pot into a freer-draining mix that mimics the orchid-cactus recipe Johnson recommended ('sandy loam 1 part; coarse leafmold 1 part; washed sand 1 part'), crock the pot well, and water only when the mix has dried out — never keep the roots wet — to keep the stem from re-blackening.
Why Epiphyllum Oxypetalum gets root rot
epiphyllum oxypetalum
Clive Innes's 1977 Complete Handbook of Cacti and Succulents places black rot among 'Stapelias and epiphytic cacti' — the very growth-form category that Epiphyllum oxypetalum belongs to (the book's own etymology gloss names it 'a cactus that roots on trees, with modified branches that look like leaves'). The blackening shows at or just below soil level and is associated with a high-nitrogen soil; the related basal-stem rot form is triggered by foot damage, cold, or excessive watering in the compost.
How to reverse root rot on Epiphyllum Oxypetalum
- 1
Unpot the plant, cut away all blackened or soft basal tissue, dust the cut surfaces with sulphur powder, and allow the cuttings to callus before re-rooting into a fresh, lower-nitrogen, more porous compost.
- 2
Re-pot into a freer-draining mix that mimics the orchid-cactus recipe Johnson recommended ('sandy loam 1 part; coarse leafmold 1 part; washed sand 1 part'), crock the pot well, and water only when the mix has dried out — never keep the roots wet — to keep the stem from re-blackening.
- 3
Spray the rescued plant and the surrounding stems with a copper-based fungicide to suppress remaining infection, and isolate it from healthy Epiphyllum oxypetalum plants until new white root growth is visible.
Keep root rot off this Epiphyllum Oxypetalum
Grow Epiphyllum oxypetalum in a porous, low-nitrogen epiphyte mix with sharp drainage (charcoal chippings in the crocking help keep the soil from souring), water only when the compost is dry, avoid overhead or winter overwatering, and keep the plant in broken sunlight with good air movement so the basal stem never stays cold and wet.