CBD/THC Greenhouse Auto Grow. Best Org Nutes? PH in Organic? Soil Type/Blend?

Hey there,

Thanks for reading! I'm new to this site as of today and looking for a little help please. This is my second grow, however the first was indoors. Looking to utilise some outdoor light this time round I have quite a few questions.

My Plan:

- Outdoor in UK in a PVC Greenhouse

- Autoflower plants mixture of CBD/THC in 16L FABRIC ROOT POTS Interested in following:

-Heavyweight Fast & Vast Auto, Sweet Seeds
-Sweet Seeds Cream Mandarine Auto XL
-Royal Queen Fast Eddy Auto (CBD)
-Sweet Seeds Dark Devil Auto
-Sweet Seeds Sweet Nurse Auto.

Any other ideas for auto strains?

- ORGANIC Nutrients/Soil not sure whether to take General Organics Grow/Bloom, any suggestions for simple Organic nutes? Also since I'm growing organic is bat guano/bat guano liquid a good option? heard about people making teas with molasses/bat guano

- Do I actually have to PH in organic? because I've heard conflicting things. I'm using UK tap water (prob let it sit out in a bucket to evaporate chlorine)

- What blend of organic soil should I use? thinking of getting an organic light mix then mixing it with perlite and vermiculite. What ratio should I use? Should I use a layer of perlite in the bottom of pots for drainage?

- If I added synthetic Cal Mag to an organic grow, would that be okay? I've heard of people using epsom salts but I was skeptical as there may then be a lack of Calcium.


Would massively appreciate any help on these subjects, thank you all!

1. Organic "nutrients" are not always truly organic. Anything from a bottle should be suspect. Best way to grow organic is to allow the mix to feed your plants and just water them. Guano is cool but worm castings are the shit. Aerated teas are good to keep your mix active with microbes but do little to feed your plants. That's why adding and brewing compost is super important.

2. No ph is almost a non issue if your mix is balanced. Be sure your water system is not using chloramine which cannot be leached off unlike regular chlorine. Clean water is VERY important in organic soil grows. I colllect rainwater in buckets and augment that with reclaimed dehumidifier water and sometimes I still need to use RO....

3. Any decent organic garden soil is good. I prefer FFOF and recycle it but you've got to start somewhere. Add a lot of perlite; more drainage and aeration is almost always better. Verm is good too for moisture control but no need for a drainage layer at the bottom. Rice hulls are an alternative....

4. NOOOO! Synthetics will kill off all the microbes that feed your plant forcing you to keep using them. Use a liquid organic cal/mag like gen organics cal/mag+ but composted eggshells, dolomite lime, garden gypsum, and oyster shell flour will provide macros once they are breaking down in your mix.

Here's a link to how I do it indoors if you want to know more....
https://www.rollitup.org/t/dick-does-dank.909077/

Look into using liquid fish fertilizers like neptunes harvest; very good stuff gives awesome results when brewed as a tea with molasses, EWC, and kelp meal. You can add jobes organic spikes for a boost just before flowering time begins. Just plug em in the dirt they are super simple to use.

Uk water systems switched to chloramines a while back, im not sure there are many older chlorine systems left but i havent checked. Go to your suppliers webpage and check as leaving water out to evaporate the chlorine is getting more and more pointless with first world water technology

Yep same as over here in New England; chloramine and flouride laden tap water systems are standard. Rain is the best option for clean water but not the most convenient. If I had an outdoor greenhouse I'd try to rig up some rain barrels with faucets. RO systems are so wasteful plus then you have to add back some macros.