Good advice already given, but ,I would add to check the Bag for the "rating" on the meal you use. Steamed bone meal generally has a 0-6-0 ( no nitrogen, no potash, and 6 parts phosphate), but some brands are different. Miracle Grow brand, while still listed as "bone meal", has a 6-9-0 rating. Any organics you use are not liable to "burn" roots, so in the hole is fine. But it's a good idea, I think, to keep track of how much nitrogen you are applying., as too much isn't good for the iris...Arlyn
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