Do any types of palm trees exhibit allelopathy
We have attempted to grow petunias and salvia in a ring around some palm trees. They are NOT thriving and some are dying. The palms in question either are or resemble a triple-stemmed "Christmas Palm."
Certified GKH Gardening Expert
Here is an article that discusses the challenges of gardening under palms and various workarounds. Basically your plants might be struggling to compete with palm roots . Also - the soil under palms is dry and nutrient deprived.