Can you share which "readily available" nutrient blends you've had success with in coco?
I just finished my 3rd grow in coco - here's my personal experience running 4 strains from seed (GDP, OG Kush; White Widow; Afghan Kush):
1st grow - coco/perlite - dry amendments (Dr. Earth) + microbes. Veg went fine, flower had deficiencies, needed to supplement with teas to get them thru. Decent quality mail colas, good terpene profiles, lowish yield, somewhat airy secondary buds, slow growth, low stretch, did not stack well. *** must let coco dry out partially between waterings or ran into issues.
2nd grow - coco/perlite - Botanicare
bottled nutes (blend of organic/synthetic products), supplemented with Botanicare
Pure Blend Tea (organic) + microbes. Veg and flower went great, good growth rates, buds denser than 1st grow, good terpene profiles, good yield, medium density, good speed of growth. *** low frequency fertigation, every 1-2 days depending on water uptake, kept medium semi damp, but not wet.
3rd grow - coco/perlite - GH nutes (3 part) - fully synthetic. Veg/flower were EXPLOSIVE, they literally grew into my lights and I had to chop in half just before flip. Super dense buds, excellent yield, no deficiencies entire grow, terpene profiles SUCK, entire grow no smell at all unless you touch buds. Currently drying and curing so I'll have to get back to you on bud quality later. *** high frequency fertigation 1-3x per day, 10+% runoff.
I would LOVE to go back to fully organic dry amendments, but I do feel like there is a very delicate balancing act with treating coco like soil. You have to make sure to not let coco dry out fully, but definitely let it dry back between waterings. Dry amendments + supplemental teas/nutes + microbes = only need to water. But I feel like even letting coco dry back and not watering as frequently, it doesn't hold nutes like soil, so I find it needs supplemental nutes throughout the grow.
My holy grail would be to be able to grow HYDRO STYLE (high frequency fertigation) in coco, but with an organic product in the reservoir. However, that doesn't seem possible because organic inputs need to be broken down before being readily available to the plants, which takes time. PLUS, organic nutes don't hold in a reservoir, they start to stink up and build biofilm within a day or two.
If I could at least find an excellent quality organic nute that can be watered in like synthetic nutes and be immediately bioavailable, that might work. So, that's what I've been on the hunt for. If you've found an organic product that provides readily available nutrients to plants (like synthetics), I'm all ears 😁