The Grow Awards 2026 🏆 
Mould on top of substrate
Dat_Maltez_Loudstarted grow question 4y ago
There is some sort of mould on the top of the substrate. I think I will spray it with diluted hydrogen peroxide.
Is this a good Idea?
likes
Dr_Drexxxanswered grow question 4y ago
Hey ! Don’t spray it ! Looks like it’s just the great white’s beneficials bacterias and fungi that shows up. You’ll be perfectly fine.
ChitownCannaChicaanswered grow question 4y ago
Trichoderma fungi—- common and it’s a sign of healthy soil! Leave it be!
1 like
Complain
PEACEMAKERanswered grow question 4y ago
Hm ml of cal mag u use? And is it organic? It can just b salt build up no need to worry but a pic would be better, good luck 👍
likes
Complain
Similar Grow Questions
Solved
Branbran
I feel that I kept my plant vegging for too long. It seems a lot taller than it should be and now I am not sure whether I should remove fan leaves or top the plants again to halt their upward growth. OR should I do nothing because they will stop growing upwards soon anyways?Week 9
Other. Mold
8y ago
2
1
Solved
ElMetitor
can 24/48 hours of darkness make mold?hello everyone, for better or for worse, the time has come for the harvest, do you think it is worthwhile to let the plants do 24 h 48 h of darkness or is she a bullshit? I have my indica for a day inside the grow with an air conditioner at 22 degrees C and a dehumidifier with 25Buds. Other
Other. Mold
5y ago
4
5
Solved
buddhi_coop
FlushingWould you all use this when flushing ? If so, how & when ?Other. Mold
Other. General questions
Feeding. Other
5y ago
2
2
Solved
mcjordan
Hi, can you take a look at all this weeks pictures and tell me do plants look healthy and ready for harvest or atleast when is going to be harvest? Also plant 3 is a bit behind, and I kind of need to harvest all at same time, should I wait week? also is flushing now a bit late?Week 9
Other. Mold
6y ago
4
3
Solved
JadamJatt
Infected Leaves. To remove part of the leaf or whole leaf?I had had pests and disease issues my second grow of Autoflowers. I believe it was hemp russet mites which spread disease on parts of many of my leaves. Would it be alright to remove only the part of the leaf that was infected or to remove the entire leaf?Leaves. Tips - Die
Other. Bugs
Other. Mold
4y ago
4
4
Solved
Cremo
What to do with a moldy bottom?Hi guys.2-3 weeks ago I squeezed one of my plants at the bottom too heavily and it started to dry out at the outer layers.A week ago I poured some fresh water with nuts on the "wound".This week it recovered very well but the dried out bottom got some mold I believe.What do I do?Week 6
Other. Mold
6y ago
4
4
Solved
Edenganj
Mold ??Hi,
This is my roommates plant. I think it’s starting to get some type of mold on it. He sprayed it down with baking soda and water I guess, not sure how effective that is. What do you guys think it is? And what should he do?
My plant will be going out there and I am worried.Other. Mold
Plant. Other
Setup. Outdoor
5y ago
5
5
Solved
DKBJJ
Seedlings are leggy and in a tray under the dome.
Dome is cracked open.
Using a T5 Reflector.
Light is as close to dome as it can go.
I have a Viparspectra 900W (R900) LED with a Veg and Flower mode.
Env con good.
Should I get these leggy bastards under my stronger grow light?Week 1
Other. Mold
7y ago
6
7
Solved
Tomdm123
Combatting powdery mildew with milk?I noticed some white powder on the leaves of my plant. At first i thought it might have been from the perlite, but it came back. So i suspect it’s powdery mildew. I took to google and it recommended me to use a milk/water solution. Will this work?Week 3
Other. Mold
5y ago
1
3
Solved
Eagers
Bud rot or normal?Hi guys does this looks normal for this stage mid-late flower? Lower leaves are starting to die off which looks normal but should leaves between buds be doing the same? I hope its not the start of budrot? Have fans on buds RH is 60-70% in greenhouse+dehumidifer+heater struggling.Leaves. Dropping off
Leaves. Wilting
Other. Mold
5y ago
2
3
Solved
BeefWellingtons
Two questions really; 1. I caught a couple of small flys on a fly strip. One was tiny and white. How worried should I be? Should I try to treat her with something? 2. The taller plant is like 2 ft tall and I am worried she will outgrow the space, is supercrop the only solution???Week 4
Other. Mold
7y ago
4
2
Solved
Pennello
Alchool extraction from Botrytis buds?Hi guys ,can I extract with alchool,from buds that were affected by Botrytis?
I read couple of thing around and in here, but did not really get it.
Can I? What would be, healthy-wise talking, the bad effects on us?
Would a alchool extraction be the best solution?
Cheers5y ago
1
1