Purple Leaves (not purple bunds!)

Hey there Scrumpy, happens every flowering right? like when the plants are making buds? that's because (and there's only one reason) they use more PK during this time , you're seeing K deficiency, you can tell by the colorful splotches. you're already adding PK but what happens is that the soil by itself and the PK by itself cannot be absorbed by the plant correctly, it needs to be broken down. This you can do using enzymes, humic acid, or beneficial bacteria like bacilus subtilis . If you check the second picture you can see some dots , this is calcium deficiency, same story as the PK, but just using one of the three things above should break up enough of what's in the soil for the plant. If not just use cal mag. you basically always need three things, one NPK which you have, one additive, one cal mag. hope this helps ! 🚀