Expensive, but worth it! Apply it when you plant, and your done with fertilizing until very late in the summer. It lasts a good three months, and it keeps the annuals covered with blooms! Master Gardener from DeWitt, MI
I've been putting Osmocote on my Hostas every year for about ten years. The growth rate before was slow but now I have size jumps in plants that are hard to believe. Double, triple and even quaddrouple in a year time. I feed in early spring and again in mid-summer.