Q.Rattlesnake Master plants
Hello,
I have 5 of these plants, since 2011. From then right up through 2017 they were great – between 3 and 4 feet tall, pretty white ball on the top. Last year and this year – they are tiny – only 6 – 12 inches tall.
Do you know what is going on with them?
Certified GKH Gardening Expert
Did you by any chance divide and transplant those last year? Or move them? They have a long taproot that does not like to be disturbed.
They are not usually bothered by pests and diseases, and they prefer dry, lean soils so you don't need to add fertilizer.
There is a possibility that the ratlesnake master stem borer lives in your area. The moth's caterpillars burrow in the stems and roots of the plant, which probably stunts or kills the plant. Also voles and other rodents wreak havac from feeding on them in winter.
Sucking insects can stunt growth, so examine the plants for any aphids, scale or spider mites. Here is more information:
https://www.gardeningknowhow.com/plant-problems/pests/insects/homemade-aphid-control.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/control-plant-scale.htm
