Any ideas what's causing this

strain: hso blue dream
Medium promix hp
Nutrients sensi bloom

Day 24 of flowering. Lower leaves have been dying for little over week. Now. Watered with 1000 ppm ph 5.8 runoff 1200-1400 ppm ph 6.0 - 6.2. Upper leaves are getting light yellow. Leaf veins are purple. I added 1/4 teaspoon epsom as I think it's a magnesium deficiency any ideas

Looks like natural nitrogen def. Maybe not enough bulk before flip. They will use alot the first three weeks, then switch over. Magnesium def/or excess would not be so uniform. More yellow veins or vise versa. But at day 24 it's sucking nutrients for the last bit of growth before focusing on the cola development.

Your buds are looking good. I have a few at 24 days too lol. Our bud development is almost exact same

sourdieselyumyum said:

strain: hso blue dream
Medium promix hp
Nutrients sensi bloom

Day 24 of flowering. Lower leaves have been dying for little over week. Now. Watered with 1000 ppm ph 5.8 runoff 1200-1400 ppm ph 6.0 - 6.2. Upper leaves are getting light yellow. Leaf veins are purple. I added 1/4 teaspoon epsom as I think it's a magnesium deficiency any ideas

Click to expand...

If I had to guess, it looks like you switched to full bloom nutrients right when you flipped to 12/12. If that is the case, run your grow nutes 50/50 with your bloom nutes until strectch is over (usually about the first 2-3 weeks of 12/12). Then progress to the regular bloom nutrient once the stretch is done. When your plant first goes from veg to flower it still requires a a good balance of veg nutrients until the stretch is over. Its what I refer to as "gassing out" when they prematurely go yellow like that.

Not adjusting ph when feed sensi bloom. When giving a plain water I adjust to 6.2

sourdieselyumyum said:

Not adjusting ph when feed sensi bloom. When giving a plain water I adjust to 6.2

Click to expand...

In what media?

Soil = adjust to 6.5

What you have there is classic too much P too early!

Red is close and his style can work with many strains.

Many others, and his, will work by simply feeding veg for 2 weeks after the flip and then 1:1 for a week. Then full on 100% bloom nutes.

Promix is the medium npk of sensi bloom combined is 5-4-8

Looks like it got worse after watering with 1000 ppm

oh and when I water to get decent amount of run off it take pots about 4-5 days till dry they are in 3 gal smart pots