Brown spots!

[Vanderwalt]

Hi, me again!

I checked my plants when I got home, and one of them has these brown spots on one of the leaves.

They were transplanted to the solo cups 5 days ago, they are in rapid rooters and generic potting mix. They sit about 5 feet from 630 cmh lights.

I have not been running the exhaust fan because it’s pretty cold in my basement.

I looked into into the troubleshooting section and it looks like ph fluctuation. I have not done any ph testing, but when I watered them yesterday I added a tiny bit of General Organics Bio Weed to the water.

Any insight would be appreciated! Thanks!

[Toker1]

Could be PH. But how’s the drainage on those cups? More perlite might be necessary for better drainage as well.

[Vanderwalt]

Could be PH. But how’s the drainage on those cups? More perlite might be necessary for better drainage as well.

Thanks for the reply. I have holes in the bottom of the cups, but the one plant with the brown spots seems heavier. I'll take it easy on the watering. When I transplant I will be putting it in peat moss, worm castings, and a compost mix that contains peat moss, calcitic limestone, kelp meal, shrimp meal and crab meal. Do I need to add perlite to that mix?

[Toker1]

Yes. Perlite has many benifits. Including keeping the soil from clumping up and soffucating the roots. If the solo cup isn’t dry in a day, or 2 max...then it’s a drainage issue. It needs to be solved right away if that’s the case.