Yellowing/purpling leaf tips outdoors

High pete, These are all signs of overfeeding and nutrient lockout like you mentioned because of overfeeding. You can try flushing it out of your soil but don't overdo this because then you create other problems like root rot. I would flush only 1 time and you can do this by slowly pour water onto the top of the soil, allowing it to drain freely from the bottom of the pot. Pour slowly, so the water doesn't overflow from the top of the pot. Use approximately four times the pot's volume in water to flush the soil. For example, use 1 gallon of water for a 1 quart pot. After the flushing you want the soil to dry out (almost) completely. After this you can continue watering like you are used to and start giving a small dose of nutes again. Happy Growing! 😋

Dry amendments does not mean it is incapable of overfeeding. Things like Dr.Earth and Gaia Green are processed so fine that they are broken down quite fast and available to the plants in a short period of time. Combine this with a good microbe environment and they are easy to overfeed if applied incorrectly. Just give them only water and hope for the best. You can try and flush out some of the built up nutrients but given that's its in the earth it will be harder to do. Good Luck!

I think you have a phosphorus deficiency here which is indicated by the purple... it is often accompanied by a calcium deficiency (yellowing). The first thing you need to do is check your pH... I don't see any indication of what level pH you're maintaining but it needs to be between 6.2 and 6.8 (phosphorus will not be absorbed if under 6.2 or over 7.0 ... calcium can be absorbed as low as 6.0 in soil but you don't want to go that low for the phosphorus). Overwatering can also cause a phosphorus deficiency... as will an excess of iron and zinc. This is an excellent article for you to read - https://www.growweedeasy.com/cannabis-plant-problems/phosphorus-deficiency Good luck!

The purpling is from low over night temps, the yellow leaf tips from over feeding. Yes it is possible to over feed with organics and dry amendments!