We are not certain exactly why Miracle-Gro Miracid Plant Food was discontinued, however it appears that Scotts has replaced it with a different product for acid-loving plants that is water-soluble and much safer around turf and other ornamentals. Miracid may cause burn on non-target plants and turfgrass, so you must be very careful applying it. We do carry many other fertilizers for acid-loving plants from Ferti-lome, Dr. Earth, and FoxFarm, among others. You may browse all our Plant Fertilizers here.
We would not recommend using the Miracle-Gro Miracid Plant Food on your evergreens because it is not labeled or designed for use on them and is more targeted to acid loving plants like hydrangeas and azaleas. You would be better off using the Miracle Gro Water Soluble All Purpose Plant Food which is for shrubs, trees, flowers, etc.
Miracle-Gro Miracid Plant Food is one of our most popular recommendations for acid loving plants like Junipers. We would recommend to stick with it!
Miracle-Gro Miracid Plant Food is labeled to be used on rhododendrons, azaleas, hydrangeas, camellias, gardenias, hibiscus, orchids and other acid-loving plants. It may cause on non-target plants and turfgrass, so apply with caution.
Miracle-Gro Miracid Plant Food is for acid loving plants. Boxwoods are not acid loving plants, so it should not be used on them.
Miracle-Gro Miracid Plant Food is applied to actively growing plants every 7-14 days during the growing season.
Since Lilacs can do well in slightly acid soils, you could use Miracle-Gro Miracid Plant Food for them as long as the nutrients match what the plants need.
We would not recommend using Miracle-Gro Miracid Plant Food on either lavender or on foxglove. Lavender prefers nutrient poor soils, and too much fertilizer can prevent blooming. Foxgloves also can suffer from over-fertilization. You can use a balanced plant food for them such as Fertilome All Purpose Water Soluble Plant Food.