The knockouts are the *worst* in hot & humid NC. They get mildew at the drop of a hat here. Working at a nursery, that means I spend hours spraying upwards of 150 rose bushes at least twice a week. Their only advantage over the drifts is more open cane growth for easier air circulation. Otherwise, each is as bad as the other.
The knockouts are the *worst* in hot & humid NC. They get mildew at the drop of a hat here. Working at a nursery, that means I spend hours spraying upwards of 150 rose bushes at least twice a week. Their only advantage over the drifts is more open cane growth for easier air circulation. Otherwise, each is as bad as the other.