Victoria
Rosaceae
tree leaf
Prunus domestica.
Victoria plums are self fertile so do not require another plum tree to pollinate them.
Victoria - as in Victoria plum.
it could
You dig a hole and put the plum tree into it.
plum tree, jade, Christmas cactus, African violet
In a plum tree.
It may be aphids.https://www.gardeningknowhow.com/edible/fruits/plum/common-plum-tree-pests.htm
spraying a plum tree with what? against what pest/disease?