A slow release fertililzer that has less nitrogen than phosphorus or potassium may be the fertilizer for a fig tree [Ficus carica]. But the use of fertilizers isn't necessarily automatic. It's more likely to be an option when the tree is grown in containers or poor soil.
Standard commercial, conventional, synthetic fertilizers tend to emphasize nitrogen ['N'] over phosphorus ['P'] and potassium ['K']. The problem lies in nitrogen's support to quick, lush above ground growth of the shoots. That growth tends to take place at the expense of flowering or fruiting.
Phosphorus promotes root health. Potassium contributes to overall health. So that's why gardeners and growers need to be careful in their choice and application of fertilizers when the fruiting of the fig tree may be at stake.
Grass clipping coffee grounds and other bulky organic materials
If the tree is established and ready to fruit then a high Potash fertilise is required.
20-20-20
it could
You dig a hole and put the plum tree into it.
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?
No.
Yes, but there is no guarantee tou will get a tree with worthwhile plums.
A Plum tree.
It is possible but it would be a waste of your time.
Mow the grass regularly around your plum tree.
The key with a magnolia tree is the amount of fertilizer you are using. If you planted a tree in an area that is surrounded by grass, the fertilizer from your lawn is more than adequate for the tree. The run off from the yard will assist the tree and the tree will not needs its own application of fertilizer. If it is in a rocky area not surrounded by grass, it would be a good idea to use an organic fertilizer.
Pine tree, pear tree, peach tree, pawpaw tree, poplar tree, plum tree.