We have a rooftop garden on the third floor of our building. Most of our planters are filled with blueberries (variety unknown). This spring, they were looking quite healthy, with lots of leaves, and many, many flowers. We had topped up the soil with Sea Soil in early May. Around mid-May, the flowers and berries started to die back. Now, we have about 30 - 50% of each plant remaining. The plants try to send out new suckers, and the same pattern keeps repeating itself; healthy growth, flowers, then die back. Any suggestions on what it might be? It was suggested to us that the plants may have "mummyberry" due to the cold, wet spring. If this is the case, any suggestions on how to treat it? I fear we are going to lose all of the plants soon (there are probably 50 - 70 plants in total).
