Fertilizing depends on where your located, what I do in the deep south may not work for you. I fertilize my seedlings a lot different than I do the display and hybridizing area. In the display and hybridizing areas they get 18-4-8 slow release(180 day) when planted in September, they also get alfalfa and chicken litter under the plant when planting, they are then side dressed with all three. During all twelve months I will foliar feed with 20-5-10 every two weeks.They get watered every other day which is more important than any fertilizer.