Try giving it a small dose of
triacontanol, which I now cannot state is achieved via the following method: handful of alfalfa hay + 1 liter of warm-to-hot water, allow to steep for about 1hr. I
hear, but can neither state unequivocally, that
Superthrive has
triacontanol in it.
Another means by which to increase root growth is to give small feedings of seaweed/kelp. There are people who are absolutely stuck on a particular species or brand, but I find they're all beneficial. If you can get the Growmore Seaweed, that stuff is excellent.
If the light is insufficient, however, all of these other efforts will be for naught. I don't remember seeing what you're growing under. Be specific. I veg and clone under the same sets of shop fluoros (4' shop lights that use pairs of bi-pin tubes) that I used years ago to grow corals and giant clams--it
can be done, but with fluoros size matters, as does spread. If you're using CFLs, you've got to use a bank of them. Light is THE driver of almost everything a plant does with regard to
photosynthesis, all you have to do is supply the right type and amount of juice (light) and they'll do their thing.
You
can grow, and grow very decent bud, in Miracle Grow. It's crappy soil, I detest even touching it for all the splinters I get, but it works. Fox Farms, in my opinion, is hardly worth the cost
or the effort, if you're going to do that then source a local
live soil, even good top-soil inoculated with microbes/beneficials will do well. I used Gardener & Bloom potting soil for my potted soil plants, because it's produced relatively locally, has live microbes and is a fraction of the cost. I use Harvest Supreme, which is another live Gardener & Bloom product, to top-dress all my veggie and OD beds, rather as a mulch that quickly becomes part of the soil. In fact, I need to get a few bags, it's gonna be spring before we know it.
