Tips turning yellow

Hi dudes,

this is my very first grow and I do not know what the hell I'm doing.

I'm in week 4 of flowering, forgot the strain name and I'm feeding BioBizz Grow and BioBizz Heaven, using BioBizz Light mix soil. Growing under Mars Hydro 600W in a 40x40 cm (less than 2x2).

I always make sure never to use too much nutes, always the exact amount as stated in the official grow schedule. In the beginning, I fed even less than suggested. I do feed every 2-3 days, when the soil gets kinda dry.

Before flowering I had too high PH, now I'm measuring it before watering. A week ago I fed 2mL of CalMag because certain leaves had turned yellow or had yellow spots on them.

My current situation is this:




I'm worried about this, the tips of top leaves are turning yellow. What do you guys think? Should I resume feeding, but with less nutrients? Or should I water it with 15 liters of water (the plant is positioned in a 9 liter pot) and check the runoff PH? Or do I just ignore it and hope for the best.


more pictures available here

I would guess feeding a soil plant every 2-3 days, is not going to end well. Generally yellowed / burnt tips suggest over fertilization. Perhaps just some good ol' water would help. For the record, one leaf tip will make it awfully hard for any of us to really help you...a full plant pic would be ideal. Good luck.

CannaCountry said:

I would guess feeding a soil plant every 2-3 days, is not going to end well. Generally yellowed / burnt tips suggest over fertilization. Perhaps just some good ol' water would help. For the record, one leaf tip will make it awfully hard for any of us to really help you...a full plant pic would be ideal. Good luck.

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sorry about 1 picture, added a second one

According to this video, biobizz should be added every time we water. He's supposed to be a credible source working for BioBizz. Frankly, I have no idea as this is my very first time.

Should I rule out the calcium-magnesium deficiency and never use CalMag for this grow?

I just figured out that I'm a dumbass. For the past 5 weeks, I've been feeding only Bloom. I did not know that you're supposed to feed Bloom+Grow while flowering.
Today I watered only with PH'd water, without any nutes. Next time, I'll add Grow and Bloom, but 50% less than advised. I really hope the yellow tips were caused by some sort of deficiency, because I was not feeding Grow.

I use full BioBizz product stack ONLY 1 time/week, if plants ask for more I do only water. In my case my tap water is EC 0 pH6.5
I don't know if this matters, I mean this water doesn't have any cal/mag

Btw, I'm having the same issue in the first week of blooming

@cananoob85 which products do you have? You should use biogrow and bioheaven the whole time

During the First weeks of flower I used only Flower. I did not read the instructions and did not feed Grow. One of my many mistakes.
Since the initial pics, my tips are still burned, maybe a bit more than before.

I am no expert, but I have seen and read that you need to feed every time you water. It says so on the biobizz feeding schedule.

cananoob85 said:

I am no expert, but I have seen and read that you need to feed every time you water. It says so on the biobizz feeding schedule.

Click to expand...

If you use COCO yes, because it doesn't retain all the nutrients like soil does.

If you use soil then feed with biobizz one time per week, if coco; you have to feed with biobizz in every watering