What’s happening to my leaves?

[CassieA]

Hi there, I’m looking for some help please. My leaves are telling me something but I’m not sure what. I’ve noticed some white spots appearing on a few leaves. I’ve also notice some burning on the tips. I’m surprised to see them the tips burn because i thought my feeding was pretty good and I assume it’s Nute burn. If anyone has any suggestions on what I can alter please let me know.

Strain: Strawberry Lemonade grown from seed

Grown in coco

Feed 1/4 strength (2.5 ml per gallon) of GH biothrive grow Every other day with 4.5 ml cal mag added.
On the non feed day i water with 4.5 ml per gallon cal mag added.

Light is 300 watt mars hydro led. On 18/6 schedule.

Ph is usually a steady 5.80 but the odd water or feed will be 5.83.

I do not test EC (i have only read about it)

When I test run off water (I get lots of run off) PPM is about 450-475 ish.

Looking to stop any issues before they become problems. Other than some spots and white / burning tips I think the plant looks great.

 

[Pennywise]

Hi Cassie and welcome, raise your Ph to 5.8-6.2 you’ll want to feed your plant every day in coco. Your Calmag seems high to me. Add 3ml of calmag to your 1/4 strength grow nutes and feed daily. Feed a couple days with ph above 6.0. That should stop the yellowing between the veins.

 

[CassieA]

Hi Cassie and welcome, raise your Ph to 5.8-6.2 you’ll want to feed your plant every day in coco. Your Calmag seems high to me. Add 3ml of calmag to your 1/4 strength grow nutes and feed daily. Feed a couple days with ph above 6.0. That should stop the yellowing between the veins.

Thanks so much for that response. I’m going to transplant tonight into 5 gallon pot. I will start right away slowly raising the ph. Closer to 6. With a couple of days above 6. I will also reduce the cal mag. To about 3ml everyday with feed at 1/4 strength. I thought that the coco “takes/absorbs” lots of the cal mag but I love your suggestions. Thanks so much. Happy growing!

 

[Pennywise]

It does, I usually hydrate my coco with a strong calmag solution to pre charge the coco.