Ideally, you should take a soil test to see which nutrients — nitrogen, phosphorous and potassium — you need, and fertilize accordingly. In the absence of a soil test, the North Carolina State University Extension recommends you use ½ pounds low-nitrogen fertilizer such as 5-10-10 per 50 square feet of iris bed.Click to see full answer. Just so, is bone meal good for irises?Irises should be fertilized in early spring about 6 to 8 weeks before bloom, and again after the blooms are gone. Because phosphate is important, we recommend bone meal or super-phosphate and a light balanced fertilizer such as 10-10-10 or 6-10-10 depending on the amount of nitrogen in your soil.Likewise, how do you get iris to bloom? Improve sunlight conditions. Irises often do not bloom because they are growing in too much shade. Most varieties need at least six hours of sunlight a day to bloom. Transplant irises to a sunny location or prune shrubs and trees that are blocking the sun. Consequently, what is the best fertilizer for bearded iris? Feed your bearded irises a 5-10-10 or 6-10-6 fertilizer in early spring when new growth emerges. Spread the fertilizer evenly over the planting area. Water it in thoroughly to moisten the soil surface but not enough to soak the area to the point of sogginess. Avoid getting fertilizer on the foliage of these plants.Is Epsom salt good for Iris?Yes, there seem to be good, relevant reasons for using Epsom salts for plants. Epsom salt helps improve flower blooming and enhances a plant’s green color. It can even help plants grow bushier. Epsom salt is made up of hydrated magnesium sulfate (magnesium and sulfur), which is important to healthy plant growth.
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