Soil pH: 6.0-7.5 Click to see full answer. Consequently, what do you feed petunias? New Petunias If you have recently planted your wave petunias, you can use a dry, water-soluble fertilizer. Choose a fertilizer with equal parts of nitrogen, phosphate and potash. This can be added into the soil prior to planting or it can be used alongside newly planted petunias.Similarly, is Miracle Grow good for petunias? Petunias are heavy feeders. It is helpful to fertilize petunias (and most annuals) regularly during the growing the season, especially when they are grown in containers. Then follow up with a water-soluble fertilizer such as Peters 20-20-20, Miracle Gro or fish emulsion every other week through the growing season. Also Know, can you over fertilize petunias? When you over-fertilize your petunias, the leaves turn yellow or brown, and they tend to suffer more from insect pests and diseases. If excessive fertilizing continues, the petunias may die. If petunias receive treatment at the first signs of over-fertilization, it is often possible to save them.Are coffee grounds good for petunias?dump my old coffee grounds on my petunias and other flowers as a inexpensive and very effective fertilizer. Petunias are heavy feeders to bloom profusely. I pour my coffee grounds into the coffee pot and use the whole solution on a different pot or bed each day. I usually get each pot about once every 2 weeks.
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