Knockout roses have become one of the most popular roses grown in the U.S. because they are easy to grow and can be grown in most areas. This is a hybrid produced by Willian Radler and introduced in 1999.
Knockout roses are available in a variety of colors, including white, yellow, red and pink. There is also a double bloom variety that produces a plant that is more bushy and compact than the single bloom varieties. These roses produce small blooms and have proven themselves to be quite resistant to common diseases that inflict most roses, such as black spot, mildew and rusts.
Knockout roses grow as bushes and are small enough that they do well when grown in containers. They grow to a height of 3-4 feet and have a spread of 3-4 feet. Knockout roses are quite hardy and bloom continuously into the fall. They need 5-6 hours of sunlight daily.
When planting this variety outdoors, start by adding a three inch layer of compost or dried manure to the soil and till to a depth of about 12 inches. Dig a hole two times as wide and two times as deep as the root ball. Place three handfuls of compost or dried manure and a handful of peat moss for improved drainage to the bottom of the hole. Place the rose so that the stem is one inch above the level of the surrounding soil. Cover the roots with soil and tamp lightly. If planting more than one plant, be sure to allow for the 3-4 foot spread of the mature bush.
Your Knockouts should be pruned in early spring on or about the date of the last killing frost of spring. Cut the bush back to a height of about 12 inches. This extreme pruning will result in better growth and healthier blossoms.
Since your roses require lots of water – especially during blooming – it is very important to water them well. Water the soil around your plants to a depth of at least two inches. Water the plants in early morning or late evening to reduce evaporation and to provide for the better absorption of water and nutrients.
Remove any dead blossoms from the plant so that it does not waste nutrients and energy. The result will be that new blossoms will be more vigorous and overall plant growth will be improved.
Add a monthly side dressing of compost or dried manure to the soil around the plant. It is important to feed your plants regularly, especially during blooming. A high quality organic fertilizer can also be used. Just follow the directions on the label for best results.
Knockout roses can also be grown in containers. Just be sure that you use a pot that is large enough to allow for unrestricted root development. Use a pot that is at least 12″ in diameter and at least 8″ deep. Be sure to place the containers in an area where the plant will get five to six hours of sunlight.
Knockout roses are the perfect choice for beginning rose growers. They are hardy and disease resistant and require little care. Their bright red, yellow, white or pink blossoms make for a colorful border or they can be planted as a highlight to a corner of your garden.