crenata
Member
Rosy Cheeks said:In theory you don't need to add any extra Ca or Mg to GH nutes. Ask ecam mace about it, he's a living fact sheet on GH nutrient ratios. R/O filters are for people that have polluted water, high EC water or simply growers that don't want any surprises and a very stable ph. Cannabis growers who simply use hard water (excess levels of Ca and Mg) without impurities do not need to filter their water since Cannabis needs almost as much calcium and magnesium as macronutrients. I hear of growers complaining about Mg def with GH in late veg and flower, but the most probable cause of their problems is a too low ph which can cause Mg and Ca lockout, or a too high EC that also can diminish Mg/Ca uptake. Excess levels of calcium can lock out magnesium, excess levels of magnesium can lock out calcium. If you add CalMag, do it moderately and check the reaction of your plants. Calcium is important to the plant as a building block for cell (plant) growth and division, and some research studies links high calcium levels to resin (trichome) production and high THC levels. If you keep a very low ph you go in the other direction.
I remember that we talked about ripen. I'm basically against ripen abuse, since running it longer than the prescribed 10 last days of the grow gives the buds a kind of uniform ripen taste. Okay if you grow White Widow, less fun if you grow Blueberry. I do have a bottle of ripen at home though, and I use it if a grow needs to be pulled in prematurely, like for instance vacation deadline or a serious spider mite problem. Ripen contains hormones that speed up the maturation process in the flowers, but between ripen fed plants cut prematurely and plants given the time they need without ripen it's a no ripen-win, IMO. I use PK 13-14 (or equivalent flower booster) mainly in early and mid flower, when the buds form and grow.
I'll check out Swecan, haven't been there for ages...
Spank u very much Rosy, U are a true shining star!
Yes I'm aware of the plus vs minus of RO, but since my water is no good for drinking so I do not approve it for my plants either.
I'm using GHE One part (hard water) also, will there be any problems too? Or should I just stick to your recommendation as well?
How do u prevent spider mites? Low RH, sulfur-burner and good ventilation? (where can I buy a sulfur burner?) At what degree do they "storm" 30 +?
Thanks again for a great reply.
mvh