Miracle Gro Slow Release Rose Shrub Food is slow release so one application will feed plants up to 6 months, removing the need for regular feeding. Miracle Gro Slow Release Rose Shrub Food uses a patented technology used by professional growers. Contains all the required nutrients for strong healthy plants. Use Miracle Gro Slow Release Rose Shrub Food between February and June. Miracle Gro Slow Release Rose Shrub Food 1kg shaker jar feeds up to 40 bushes.