Yellow leaves can follow normal winter rest, overwatering or root damage, an overly dry active-growth plant, low light, excess fertilizer, chill, poor drainage, nutrient shortage and mealybugs.
Desert rose yellow leaves: what to check
Check the season and caudex before watering a yellowing Adenium obesum. Winter rest, wet roots, dry active growth, low light, chill, fertilizer or mealybugs can overlap.
Plant coveredAdenium obesumDesert rose · indoor container
Check the leaves, stems and pot
Which leaves are yellow?
Record whether yellowing affects older lower leaves during winter rest, new leaves or the whole plant, and whether leaves are soft, dry or dropping or paired with a soft caudex, wet mix or pests.
Check whether the mix is wet or dry, whether the caudex and roots are firm, how much bright light the plant receives, whether temperatures fell toward rest or chill conditions, and whether fertilizer or mealybug activity changed.
Use the visible signs to choose the next check
Possible causes and next checks
Compare the season and root zone before acting: respect winter rest, correct saturation or prolonged dryness, provide bright light, protect from chill, and review fertilizer or visible mealybugs only after checking the caudex and drainage.
Watch for new damage or recovery
What to watch next
After the plant returns to suitable light, temperature and water conditions, compare new growth and the caudex with the affected leaves. Continuing yellowing, soft tissue or repeated drop needs another season and root review.
Do not diagnose from one sign alone
What yellow leaves cannot tell you
Sources
- University of Florida IFAS ExtensionDesert rose; light; water; fertilizer; rest; mealybugs
- University of Florida IFAS ExtensionDesert rose yellowing and leaf drop; causes and care
- Oregon State University Landscape PlantsHouseplant; container; drainage; minimum temperature
- Iowa State University Extension and OutreachYellow, brown or dropping leaves; environmental causes; older leaves