Queen Elizabeth Rose Hedge
I have a Queen Elizabeth rose hedge comprising 22 rose bushes hedge is now 5ft high. It has bloomed all summer but is blighted with black spot even though I have sprayed the hedge 4 times since April. Apparently if you clear the ground when all the leaves have dropped off and dilute Jeyes fluid in a watering can and give the ground a good soaking this may prevent black spot reoccurring. Has any one heard of this as a possible solution?