Day 18 I topped them all this past Saturday on day 15, and they've hit their growth spurt with the GC @ 8 inches & the KK @ 7 inches. The KK when matured has been a short plant for the most part-I've had a pheno or two that were a bit taller-so not disappointed by the smaller stature of the KK-they make good bushes :) I'm watering every 2nd or 3rd day at this point, about 8 oz of water each with 1/4 tsp Bioag Ful-power fulvic acid.
Green Crack on the left, Killer Kush on the right, both strains are considered "Fast" with a flowering period of 6-7 weeks.
The starter soil is an 8 qt bag of Miracle Grow "Organic" potting mix (I put organic in quotes b/c I'm not to hip on anything Miracle Grow-that being said, they did very well in this soil mixture) with about 4 qts of earthworm castings and about 2 qts of pearlite and just 1/2 tsp of yucca powder as a wetting agent. Mixed that all very well in a 20 gallon bin and divided it up amongst the 4 pots. Once the current Killer Kush grow finishes, these will be transplanted to 7 gallon fabric pots with a mixture of pro-mix, ewc, compost & pearlite with 2 TBS/gallon of FoxFarm All purpose organic dry fertilzer, as well as about 1 tsp of azomite & 1 tbs Roots Org Elemental, 1 tbs of diatomacious earth amended in. This mixture has been stored in 20 gallon rubbermaid bins for the past several weeks to "cook"