Potted Roses

PARADE Cecile (Poulpar050)











PATIOHIT Silvia (Poulpah054)











PATIOHIT Isabel (Poulpah053)









 
 

Danish rose breeder Poulsen Roser A/S offers four collections of potted roses for greenhouse culture. All of the varieties have a long postharvest life lasting up to 28 days. Plants in the PARTY miniature rose collection are generally finished in small containers up to 4-inches. Cultivars in the PARADE collection are generally finished in 4-inch pots and can be used in containers as well as being able to be planted in the garden. Minimum container size for finished plants in the PATIOHIT collection is 6-inches or larger. The PALACE collection is best suited for 6-inch and larger containers. These are bushy polyantha roses that produce large double flowers and bloom continuously during the summer.

Green Leaf Plants offers the collections in several product forms. Plants started in Green Leaf’s 4-inch pre-finished Pinch ‘n’ Go rose liners do not require transplanting or pinching. PARADE roses are supplied as 4½-inch liners with four cuttings guaranteed. PATIOHIT roses are offered in 6-inch pots with a guarantee of six cuttings. Both of these collections are offered as an economy freight 12-strip liner with three cuttings per liner.

The PARADE collection can be finished in either the original 4½-inch liner or potted up into larger size containers. Transplant liners ½- to 1-inch deeper than the original pot-soil line. Use a well-drained growing medium with a pH of 5.8-6.3. Don’t allow the medium to dry out.

At each irrigation, apply a liquid feed of 200-250 parts per million nitrogen from a complete fertilizer that contains the majority of nitrogen in the nitrate form and extra micronutrients.
Provide supplemental iron to avoid a deficiency that can result in interveinal chlorosis of the upper leaves.
Reduce fertilization rates to 125-150 ppm nitrogen during the last two to three weeks of production or do periodic leaching with clear water.

Grow under full sun. Supplemental light (350-500 footcandles for 13 hours) is recommended for early spring crops.
Maintain day temperatures of 68°F-70°F and night temperatures of 62°F-65°F. Growing plants at temperatures below 64°F can increase production time by two weeks. Use caution when ventilating greenhouses to prevent cold air from dropping down on the plants making them more susceptible to disease. Maintain a relative humidity of 60-70 percent. A higher relative humidity, up to 85 percent, can be used temporarily to encourage shoot development after pinching.

Plants started from the Pinch ‘n’ Go liners can be finished without providing any pinch in about six weeks. Plants can be pinched three to four weeks after liners are transplanted. Pinching increases the total production time to 10-12 weeks. A good standard for pot sizes larger than 3 inches is to achieve a plant height 2½ times the pot diameter.
Plants are also responsive to DIF. Don’t use more than a 5°F negative DIF to avoid weak stems and flowers.

Insect problems can include aphids, spider mites, thrips and whiteflies. Disease problems can include powdery mildew, downy mildew, root rots and botrytis. Use a preventive program of sanitation, environmental control and application of fungicides.

For more: Green Leaf Plants, (800) 321-9573; www.glplants.com. Poulsen Roser A/S, (541) 840-8170; www.poulsenroser.dk.