That must be very frustrating Phil. When you've got a nice garden to look out at (well, soon!) it would be much better to look out through one big window and see a wide vista.
Good luck on that one!
As for keeping track of jobs to do with trees, FG doesnt have a Tasks program for that purpose (IG and IG Pro do)
But, heres a suggestion - crude, but it would work in FG.
Create another garden called Things to do
In it, Create 12 garden areas called Jan, Feb, Mar etc.
Use FG038 to put your plants into the Month they require attention.
You can add the same plant to one or many months (or as many gardens as you like, of course).
Then ypou can put notes about what to do in the Plant Details field.
Would that work for you?