I don't advise using the spikes, or anything that is 'time-release' - you don't want much available nitrogen during flowering - if you use that Miracle-Gro, use it only once every 2-3 weeks, and dilute it to half-strength - better yet, apply it foliarly, then you can't overfertilize as easily (advise 1/2 tablespoon per gallon) - you will now receive lots of "NO Miracle-Gro" screamers - I've used it for 40 years, BUT, it is easy to overdo it, since it is so strong - that's one big reason it gets such a bad rap - (plants can't tell chemical nitrogen from organic nitrogen, either, so don't fall into that myth) - the 'designer' ferts used by most of us, are generally much weaker, so less over-fert happens - let the flames begin ! :smokin: