Hi all - hoping some of the more experienced growers could give me a little guidance here.
Problem: Leaf tips have been yellowing for a couple weeks now, but never moving too far up the leaf – literally just the tips. The last week or so, all of the leaf mass seems to be getting a bit pale – at first light green, and now getting more yellow.
Medium/grow method: Soil (Ocean Forest/Perlite); 3 gallon fabric pots.
Feed: I’ve been Fox Farm Grow Big every other watering since about week 4 (about 2 feeds a week). Usually about 1/2 the dose recommended by manufacturer – but I skipped the last feeding in light of what I thought was nute burn evidenced by the discolored tips, and the feed before that I only used a 1/4 dose for the same reason. I’m also supplemented with 1/2 dose of CalMag and Silica every other week (but have held off on that for a couple of weeks in light of leaf coloring issues). First tiger bloom feed this week - 1/4 dose with 1/4 dose of Grow Big. I was watering every 3 or 4 days for first 30-35 days; now I’m having to water every 1.5 to 2 days – very thirsty plant
water source: city water; runs a little acidic, so usually have to PH down to about 6.3-6.5.
Strain/age: Northern Lights Auto - ILGM. Just finished Week 7. Still not entirely sure what the difference is between “pre-flowering” and “flowering”, but she started throwing off pistils around Week 5. I didn’t get much of a stretch at all – she’s only about 24 inches tall from the floor (about 12 inches from the soil). I was holding off on starting the bloom ferts in the hope that I get a little vertical push, but it didn’t really materialize. Perhaps I waited too long to start bloom ferts and this is a potassium deficiency? Overall the plant has a nice little canopy. About 12 or so decent colas all with equal access to the light.
Light: HLG 260xl - about 18 inches at 250 Watts; 20/4 light schedule
Climate: Indoor Tent; running a Cloudline T6 inline exhaust fan with Carbon Filter; passive intake; couple desk fans pushing air around; Temps: 78-79 during the day; 69-70 at night; RH: 45-55.
Any ideas what I might be dealing with here? Is it worth running a sledgehammer flush at this point, or is that going to just create more problems for me? I’ve tried to look at some deficiency/toxicity diagrams/photos on the internet, and it’s tough for me to figure out exactly what’s going on. Any ideas?? Thanks so much!!