Troubleshooting
Hoya Carnosa 'Rubra' problems — and how to fix them
Hoya Carnosa 'Rubra' (Hoya carnosa 'Rubra') is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Won't flower
Usually too little light, too much feeding, or repotting too often. Give brighter indirect light, leave it slightly pot-bound, and never cut off the old flower spurs (peduncles).
Loss of variegation / reversion
The pink and cream fades to green in low light. Move to brighter indirect light to maintain the 'Rubra' colouring, especially on new growth.
Root and stem rot
From overwatering or a dense mix. The low-chlorophyll variegated foliage is especially rot-prone; use a chunky epiphytic medium and let it dry well between waterings.
Mealybugs
Hide in leaf joints and flower clusters as white cottony masses. Inspect regularly and treat with insecticidal soap, neem, or 70% isopropyl alcohol on a cotton swab.
Prevent hoya carnosa 'rubra' problems before they start
Most hoya carnosa 'rubra' issues are care-mismatch, not bad luck. Dial in the basics:
- Common hoya problems — the species this cultivar belongs to
- What's wrong with my plant? — the diagnosis apps compared
- Hoya Carnosa 'Rubra' watering schedule
- Hoya Carnosa 'Rubra' light requirements
- Best soil mix for hoya carnosa 'rubra'
- Hoya Carnosa 'Rubra' temperature & humidity
- Full hoya carnosa 'rubra' care guide
Looking for hoya carnosa 'rubra' in general rather than its problems? Read the full hoya carnosa 'rubra' care guide — light, water, soil and feeding.
Hoya Carnosa 'Rubra' problems — FAQ
Why is my hoya carnosa 'rubra' won't flower?
Usually too little light, too much feeding, or repotting too often. Give brighter indirect light, leave it slightly pot-bound, and never cut off the old flower spurs (peduncles).
Why is my hoya carnosa 'rubra' loss of variegation / reversion?
The pink and cream fades to green in low light. Move to brighter indirect light to maintain the 'Rubra' colouring, especially on new growth.
Why is my hoya carnosa 'rubra' root and stem rot?
From overwatering or a dense mix. The low-chlorophyll variegated foliage is especially rot-prone; use a chunky epiphytic medium and let it dry well between waterings.
Why is my hoya carnosa 'rubra' mealybugs?
Hide in leaf joints and flower clusters as white cottony masses. Inspect regularly and treat with insecticidal soap, neem, or 70% isopropyl alcohol on a cotton swab.