First ever time, any advise would help

[Josh.c.r.c]

Hi guys and girls,
Looking for abit of guidence and advice! Please take time to read.
First ever time at this hobby, these are looking lovely BUT
They are 91 days old and are obviously behind, I have ran in to a few issues
They are growing in a outdoor/indoor setup that's in the ground but with a box around them outside, this means the temp doesn't drop below 23'
Anyway how long should I further feed then flush for?
Its just to finish of these to the best they can as I know what I need to do with next ones.
I am well past the days specified on packets and I know you are likely to achieve these with perfect conditions. I unfortunately am stuck with what I have,
Grown in compost
Plenty fans and air flow
20 pound led of wish about 600w
Veg and bloom light working beautiful
Been using bio bizz nutrients
But struggling to feed to any schedule due to the constant moisture in the ground, they have been flooded twice due to heavy rain.
As I say not the easiest way but I have to work with what I can for now, any help or advise would be greatly appreciated
Strains I have are 2 seedsman and are
Og Kush
blueberry
And one Pineapple express
From barneys

 

[Mañ'O'Green]

This should help. You do not need to flush in the ground as you say you are having a hard time applying nutrients.

 

[Josh.c.r.c]

Thanks for the reply, I've got one on the way, its so confusing taking everything in, just cant wait untill they are done now to get on with next hash