my plum tree has black sacs on it - Knowledgebase Question

norcross, Ge
Question by remix_con
May 31, 2010
my plum tree has black sacs on it and the branches so i don't know what that is and my branches are growing real big, im not sure if that's good or bad because my brother says it'll give the plums more nutrients,fatter and juicier if we trim the branches,should i??

Answer from NGA
May 31, 2010


The black sacs are probably sap that is escaping from the branches. They will look like sticky drops hanging from the branches. Some will turn hard and others will just drop off the tree. It is not true that your tree will produce bigger, juicier plums if you prune it back. The way to get fat, juicy plums is to thin the plums when they are about an inch in diameter. Just prune or pull off about a third of the plums on your tree. The remaining plums will grow larger because the tree will have more energy to put into each one. Plum trees should be pruned in the late winter. If you prune it in the summer it will develop suckers (upright, non-productive growth). So, wait until this winter to prune your tree if it is getting too large.

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