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Only a couple of the rose bushes survived.

May 05, Water at the bottom to avoid promoting diseases. Even though Knockout roses are disease resistant, it is still better to take these steps. Help keep the moisture in the ground by lightly mulching around the base of the rose bush, leaving about an inch gap near the main trunk to avoid mildew or disease.

I am not happy, though, about the fading of the flowers on this variety.

On the flip side, don't overwater your roses. Your Knock Out Rose will usually triple in size after cutting it back to about 12” tall, so you can expect it to grow to about 3’ by the end of the season. 3: Trim out Smaller Canes After you cut back, check your rose bush for any smaller or damaged canes that may need to be removed to promote better growth and air flow in between branches.

Knock Out Roses are tough and can make it through anything. But, if you live in an area with harsh winters (zones 4 and below) there are a few things you might want to try. In-ground: Add" of mulch, leaves, or pine/fir boughs around the base of the plant. Jun 11, When caring for Knock Out roses, feeding them a good organic or chemical granular rose food for their first spring feeding is recommended to get them off to a good start.

Foliar feedings from then on until the last feeding of the season works just fine to keep them well-fed, happy, and blooming. TIP 1: Use a balanced fertilizer or fertilizer formulated for roses from your local garden center and apply after the first wave of flowering (be sure to follow the specified rates and method of application provided on the product label). TIP 2: Make sure the soil is moist before you fertilize to avoid burning the roots.