Westcoast- have you used osmocote before? we use it at the plant nursery I work at and also have used to use it myself outdoors, still do for container gardening for annuals just not ganja. I'm not certain whats it made with but I quit using it and now use strictly organic materials and not just I but others have commented on the taste difference. I takes a good 3 months to breakdown completely and the soil. afterwards I the containers always appears devoid of microlife. i will find worms in containers using organic products at seasons end but never in the containers where osmocote was the fertilizer used.
it is cheap though so in that manner it is appealing but a bag of foxfarms marine cuisine or similar product would work the same as the osmocote and be beneficial to the microbes in the soil. also the end product should taste better.
you've an excellent patch and probly know as much/more than myself but just a suggestion. I wish we could rock patches like that in my area it is a tad to urban. it is the countryside but still well used.
anyhow defintly jealous of that nice patch