Since breaking top soil I just fed water 5 - 15ml for 21 days. On day 22 I started using big bloom one feeding and kelp me kelp you the next feeding every other week. Medium is pre mixed with dr earth bat guano 7-3-1, veg & tomato 4-6-3, bone meal 3-15-0 and langbeinite 0-0-22 at half package dosage.