Help diagnosing a few sick leaves

Relatively inexperienced grower, hoping to get some input from more seasoned eyes.

For the most part, plants appear healthy, vigorous growth, vegetating at about 7 weeks from seed, jack herer plants. 1x 400w MH, 1x KIND L300 LED, 4ft square 7ft tall tent.

Soil is roughly 1/3 FF Happy Frog, 1/3 Ocean Forest, 1/3 worm compost from home bin, few cups of perlite. I’ve also applied an aerated compost tea once, occasionally add a spoon of big bloom to watering, and sprinkled an organic 5-3-2 blend on soil every 10 days or so. Soil ph is 7.0. I have two co2 bags in the tent. Strictly RO water going in.

Ongoing issue has been temp, as it’s quite hot outside I’m only able to keep the temp at about 83, with occasional spikes up as high as 90, never more then a few mins. The plants don’t seem generally distressed by it, but then again I am seeing this issue specifically with lowest, oldest fan leaves. On a given plant maybe 1 or 2 leaves are afflicted, rest of plant looks great.

I’m concerned that maybe the ph is a little high, maybe I’ve fed a bit too much, or maybe the high temp is locking something up.

Any thoughts.

rhino_roll said:

Relatively inexperienced grower, hoping to get some input from more seasoned eyes.

For the most part, plants appear healthy, vigorous growth, vegetating at about 7 weeks from seed, jack herer plants. 1x 400w MH, 1x KIND L300 LED, 4ft square 7ft tall tent.

Soil is roughly 1/3 FF Happy Frog, 1/3 Ocean Forest, 1/3 worm compost from home bin, few cups of perlite. I’ve also applied an aerated compost tea once, occasionally add a spoon of big bloom to watering, and sprinkled an organic 5-3-2 blend on soil every 10 days or so. Soil ph is 7.0. I have two co2 bags in the tent. Strictly RO water going in.

Ongoing issue has been temp, as it’s quite hot outside I’m only able to keep the temp at about 83, with occasional spikes up as high as 90, never more then a few mins. The plants don’t seem generally distressed by it, but then again I am seeing this issue specifically with lowest, oldest fan leaves. On a given plant maybe 1 or 2 leaves are afflicted, rest of plant looks great.

I’m concerned that maybe the ph is a little high, maybe I’ve fed a bit too much, or maybe the high temp is locking something up.

Any thoughts.

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What does the plant in general look like? I run close to 85F most days and haven’t had any leaf issues.

If it’s specifically lowest and oldest fan leaves, then you are dealing with a mobile nutrient deficiency. See attached chart. Tips yellowing is pottasium I think and splotches are phosphorus? I would reccomend against RO water, the minerals in tap water are goodfor the plant, like calcium, which you make be lacking.

In my opinion overall they look healthy - I’m a fairly experienced with plants in general just not as much w/ canna. There is some wilting in this pic because I do tend to let them dry a bit between watering, soon as I notice they’re thirsty I water.

I hadn’t considered water source, that makes sense. I am on a well, water is hard at almost 200ppm out of the tap (it tastes awesome, house guests routinely comment), but I don’t know what the composition is. Would it make sense to cut tap with ro?

I feel like I’ve laid on organic nutes fairly heavy, but a mineral deficiency hadn’t really occurred to me. Thanks.