To what purpose? Do they need to be fertilized?

I was gonna touch on this in your other thread. What I do is hold off early September and then will often give that one maple (which is situated in the poor soil) a good dosing of fertilizer and several waterings to soak the stuff in. Come spring, it has thus always flushed out extra strong and full. Because our growing season is short and nights temps rapidly begin to drop close to freezing by mid September, trees have begun to harden themselves off and there's generally little fear of fertilizer then inducing new growth, especially so when dealing with a specimen in a weakened state.

"Tree" is a pretty broad category- maybe narrow it down a bit?

Lemon tree, oak tree, apple tree?

where are you..what tree.. how big is it .. is it potted.. and why do you think it needs fert???

ken

Have no idea of you location in this world but in my area, fertilizing with nitrogen in mid summer to fall can cause a tree to put out new growth, that doesn't harden off in time before winter, resulting in some level of winter kill by next spring.

For what type and size of tree? When were/was they/it planted? Where (generally) are you located? In a container or in the ground?

Generally trees don't need fertilizer. Some fruit trees (citrus, avocado) do.

if you live in a state with an early freeze, then no. If you experiencing a heat wave (not normal for your zone) then no. Only time I fertilize my trees is when my lawn gets fertilized.

You're right Bill......I'm just mega frustrated at the unbelievable waste of a summer my maples have had. Out of three of them, one grew 3" and that was it. I'm starting to think my hard clay is the culprit. This year has been one of our hottest summers. I have no clue why they aren't growing. My weeping willow has put on 8" maybe and last year it did over 2ft. Btw, I'm in the cold prairies in the same zone as you in Alberta.