i have 2 bridgesii, a san pedro, and a Peruvian torch under a 100 watt grow light in a 75-80 degree room and a feel that maybe my bridgesii and the pedro are yellowing a bit compared to when i got them. i water them when the soil gets dry. ive read that they need afternoon shade or a 30% shade net, does anybody use a shade net for there trichocereus? do they actually look yellow or is it in my head? any growing advice is welcome

Yellow means / can mean to much light = Try it with less .

" does anybody use a shade net for there trichocereus? "

Mine were in a room with no direct sunlight and the rollerblinds were down . They were all lovely green , had the goods in them and grew to 3.6 m . Then i had to cut them down because they had no more room to grow upwards .

how much light would you recommend?? i currently have them under 12 hours of light. ive ordered a 30% shade net, should be here soon

can a 100 watt light really provide to much light?

I cant realy recomend you anything i'm not an expert and i dont know their " set and setting " . There are others here who know more than me .

You have to balance 4 things = Light , temperature , water and ...... what you want to achieve / your expectations = ...... experiment and ...... have patience .

no, not at all, they need more light to thrive

shade cloth might be needed in Full sunlight in hotter climates only

ps, cacti look good

thanks for the advice guys and this is what i mean by 100 watt light, it actually might be a 125 watt im not sure, my friend is letting me borrow it for the winter

That should help. The plant is definitely not getting too much light from that one you originally posted. Yellowing can also be caused by not enough light. Which I'm guessing is what's going on. It may be nutrient deficiency too, but I'd just try out the new light for a bit.

Good luck!
hostilis

ive had them on a 12/12 light cycle but i was going to start a 14/10 tomorrow or should i do a 16/8?? my "grow room" is also my bedroom so that might be annoying for me.


i just got the schultz cactus food and used it for 1 or 2 waterings then my buddy who gave me the light also gave me the pure blend tea that ive used for one watering. i like it more cause its organicish and has earthworm castings and fish meal which ive read is good for them, the only other things in it are seabird guano and kelp. should i be feeding every watering or just some?

sounds like an invitation to make tea on an empty stomach ::3

I do 16/8 on/off with my artificial lighting. But 12/12 works. I feed my trichs (depending on how fast they're growing, the more they grow the more I feed/water) every other week. Has it been growing a lot?

the larger bridgesii deff has been growing and i think the puruvian may have new growth, the small bridgesii and the pedro not so much. ive had the pedro and 2 bridgesii for only a month and the puruvian for about 2 weeks.

ive kinda been wanting to eat that small bridgesii anyway