You’ve got to kill Bermuda grass when it’s alive, which starts growing in late spring, and seed the bare areas after all the grass in that area dies.
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Fireblight, or fireblight disease, is one of the few bacterial plant diseases that threaten cultivated fruit trees and ornamentals.
To increase the size of pomegranate fruit, focus on pruning, applying fertilizer and watering enough so the plant doesn’t get droughty. Right now, because it is late fall and it is getting colder, there is nothing to do.