Newly Planted Photinia “nana” Red Robin Dropping New, Small, Bright Red Leaves?

Question

Hi, I planted a very large established Photinia red robin tree (topiary, about 7 feet tall with multiple “balls”) a couple of weeks ago. The soil is clay but I amended it with lots of compost, dug a very large hole for it and planted it at the same height as it was in the very large nursey planter with some mycorrhizial funghi to help establish the roots and a handful of blood fish and bone mixed in. It is in a fairly sunny area of my garden. Since planting, there was a flush or bright red new leaves, but in the last couple of days they have fallen off. The fallen leaves are small new leaves, bright red, and don’t look deformed/curled or spotty in any way, just perfect little red leaves but falling off. The new growth falls off at the slightest touch when you brush against the tree. I have watered it a few times since planting but don’t want to over water it. What could this be? Is it just transplant shock? I’m presuming this tree has been in a pot for many years as it was purchased as a mature specimen. Grateful for any advice, many thanks.

Answer 1

It could be transplant shock, but you do want to water newly planted shrubs often to begin with to help them establish and soften the blow of transplanting. Photinias also need well-draining soil and full sun to part shade. Go ahead and water often enough to keep the soil moist but not saturated. Here is more on their care:

https://www.gardeningknowhow.com/ornamental/shrubs/photinia/growing-red-tip-photinia.htm