Help: Leaves turning yellow

[Alexanderz]

Hi!

I have a problem with my outdoor girls. They started to get yellow leaves from the bottom up. I thought it was because they are 1/3 into flowering, but it looks worse than that.

Some data:

- 3 sativa's (red point strain), only one with the problem (so far) planted close in a triangle shape.
- Several of the yellowing leaves already fell
- looking at the problems diagnostic tool, It looks like phosphorus deficiency, but I have not much experience to really tell
- biobizz nutrients
- brown splotches in yellow leaves (view images)


What could it be?

Thanks in advance guys!

[Gingerbeard]

Don't sweat it. Old, low fans will do that. If sweating is your thing, add a little N to your flowering nutes.
Older fans will often turn color and fall off, much as trees and other plants do in the autumn. Your plants are autumn-ing.

[crucialbunny]

Gingerbeard is right on the money. If a majority of leaves were turning then you would have cause or concern. I don't particularly like to see them on my plants for purely aesthetic reasons, so I take them off.

[Bluey]

To reduce that quite a lot a kelp extract added to your water schedule once per week/fortnight works well.

It works pretty well outdoors but dont over water, that will add to it.

[Sixwinds]

2nd this, plants fucking love kelp!

[SoOrbudgal]

Just try to allow the soil to dry between waterings and not soggy floor the roots are in. Don't add any fresh compost ontop of the base. Those sativa plants need long days of dry and lots of direct sunlight. I have shaken the plants after a rain to ward off stem rot and try to get air flow.

[Alexanderz]

Maybe the problem is watering: I have been watering with a hose with drops and do not let it get dry in between waterings.

I will let it dry in between waterings.

I'll also add some N and kelp extract as suggested (just in case).

There are 26 days left for autumn to come were I am now, so I think my girls blossomed early? (First outdoor experience)

Thanks for the insights!

[Bluey]

Kelp extract is typically high in N. Don't do both.

20ml/10ltrs on first water. Wait a week between watering unless it is particularly hot and windy.

[Alexanderz]

Ok I'll keep the kelp and see what happens