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Extension > Garden > Yard and Garden > Flowers > Rose blush chrysanthemum

Rose blush chrysanthemum

Peter Ascher, Neil Anderson, Vince Fritz, Steve Poppe, Tony Strasser, Roger Wagner, Dave Wildung

The newest Mum from the University of Minnesota Department of Horticultural Science

chrysanthemum

A rosy new profusion of chrysanthemum color is now available to the gardening public from the University of Minnesota. The university announces its new 'Rose Blush' chrysanthemum.

'Rose Blush' was developed from a cross of two popular parents, 'Minnqueen' and 'Rosy Glow' mums. Both parents are also recent releases of the University of Minnesota garden chrysanthemum breeding program.

'Rose Blush' is noted for its profusion of blooms. They start early in the growing season and continue up to the first freeze. Its flowers are partially frost resistant.

'Rose Blush' blossoms start out mauve in color, but change in shade as the flower ages. And while this "fading" of flowers is not desirable in red or purple cultivars, it is an attractive feature with this flower color.

'Rose Blush' flowers are 2 to 3 inches in diameter, fully double, and of the flat decor-ative flower type. It blooms earlier than either 'Minnqueen' or 'Rosy Glow' mums. Flowering begins as early as July 29 in Min-nesota. Full bloom is usually by August 11.

'Rose Blush' differs from 'Grenadine' and 'Dark Grenadine' (patents 5338 and 7632, Yoder Brothers, Barberton, Ohio) in bloom size - it has larger flowers - plant habit, and earliness. In plant habit and shape, it closely resembles its 'Minnqueen' parent.

'Rose Blush' has a spreading plant habit with intermediate to stiff stems. Plant height is usually 13 to 17 inches; plant spread is 14 to 18 inches. Foliage is medium green and remains disease-free in appearance at trials in all field disease nurseries.

'Rose Blush' is adaptable to pot culture as a spring flowering plant under natural day photoperiods. The application of a chemical growth regulator is recommended for commercial production.

Planting time

Plant 'Rose Blush' chrysanthemums in the spring after all danger of killing frost has passed. Use small plants derived from rooted suckers of old plants or new plants from a local source. Larger plants in various stages of development may be planted anytime during the summer or early fall.

Soil, site, and fertilizer

'Rose Blush' chrysanthemums grow best in full sun and well-drained soil. Incorporate peat moss, com-post, or well-rotted barnyard manure and superphosphate (3 to 5 pounds per 100 square feet) into the soil. If you use peat moss or do not add organic matter, apply a commercial fertilizer in the spring (such as 5-10-5 or 10-10-10) according to package directions. Side dressing plants with a complete fertilizer in early August is recommend-ed, especially in years of abundant rainfall or irriga-tion. A second application may not be needed if a 'slowly available' fertilizer is used in the spring.

Cultivar selection

'Rose Blush' chrysanthemums bloom before the end of September and are a good selection for the Twin Cities area. Later blooming cultivars fail to bloom before damaging or killing frosts in most years. Like most chrysanthemum cultivars, 'Rose Blush' will usually bloom earlier in northern Minnesota and later in southern Minnesota.

Watering

Do not let 'Rose Blush' plants suffer from a lack of water. One good watering or rain per week, about one inch of water, is usually adequate.

Insect and disease control

Spraying or dusting with an all-purpose insecticide-fungicide mixture twice a month from June through September is recommended for 'Rose Blush' chrysanthemums.

Late flowering

Possible causes for late flowering of 'Rose Blush' chrysanthemums include insufficient sun (shaded), fertilizer, or water; pinching too late; root competition from nearby trees and shrubs; unusually hot weather, especially nights, in August; unusually cold weather in August and September; and insect or disease injury.

Over-wintering

To safely carry 'Rose Blush' chrysanthemum plants over the winter, use one of these methods to prepare your plants in the fall:

Dividing

chrysanthemum

'Rose Blush' compared to a selection of other popular University of Minnesota Chrysanthemum Cultivars

Although no chrysanthemum cultivars are consistently hardy under Minnesota's winter conditions, as with other mums, sections of 'Rose Blush' clumps will frequently survive. If an entire clump does survive the winter, it is preferable to divide it into small clumps, each with two or three growing points, rather than allow it to continue growing as a single plant.

Availability

'Rose Blush' may be propagated only by licensed parties. Firms or individuals desiring to propagate and merchandise cuttings of 'Rose Blush' must apply for a license. Contact Dr. Peter Ascher, Department of Horticultural Science, Uniuversity of Minnesota, 1970 Folwell Avenue, St. Paul, MN 55108. Individuals may also contact these licensed propagaters: Dooley Gardens, Route 1, Hutchin-son, MN 55350 (612/587-3050) or Donahue's Greenhouse, 420 10th Street Southwest, Fairbault, MN 55021 (507/334-8404).

Variety*   Flower colorPlant DescriptionHeight**Time of bloom***
Centennial SunBright golden yellow1 1/2" double decorative MediumEarly
CenterpieceRose-lavender, gold centers4" quillTallEarly to midseason
Gold CountryPeachy bronze to golden yellow 4" double, decorativeTallMidseason
Grape GlowBright rosy purple3 1/2" flat decorativeMediumMidseason
LemonsotaLemon Yellow1" pomponLowMidseason
LindyLavender pink4 1/2" quilled incurveTallMidseason
Maroon PrideRich dark red3 - 3 1/2" flat decorativeMediumMidseason
Mellow MoonCream4 1/2" semi-incurved decorative MediumMidseason
MinnAutumnReddish bronze2 1/2" formal decorativeLowMidseason
MinngopherCrimson red2 1/4" decorativeLowLate
MinnqueenBright rose pink3" decorativeLow-mediumMidseason
MinnroseDeep rose pink1 1/2" pomponLowMidseason
MinnwhiteWhite2" decorativeLowEarly
MinnyellowRich lemon yellow2" decorativeLowLate
Rose BlushMauve2 1/2" flat decorativeMediumEarly
Rosy GlowDeep rosy pink4" decorative incurvedMediumMidseason
SnowsotaWhite, cream centers1 1/2" pomponLowMidseason

* Names beginning with Minn indicate cushion habit of growth. Names ending with "sota" indicate a pompon flower type.

** Low, up to 12 inches; medium, 12-18 inches; tall, over 18 inches. Height is for first year plants properly spaced and grown in full sun.

*** Twin Cities area plantings. Early starts blooming before September 1; midseason, September 1-15; late, September 15 or later.

# Author affiliations: Peter Ascher, Neil Anderson-Department of Horticultural Science, St. Paul, MN 55108; Vince Fritz-Southern Experiment Station, Waseca, MN 56093; Steve Poppe-West Central Experiment Station, Morris, MN 56267; Tony Strasser-Southwestern Experiment Station, Lamberton, MN 56162; Roger Wagner-University of Minnesota Technical College, Crookston, MN 56717; Clifford Wilcox-Rosemount Agricultural Experiment Station, Rosemount, MN 55068; Dave Wildung-North Central Experiment Station, Grand Rapids, MN 55744.

Photos by Dave Hansen and Don Breneman. Design, editing and production by Larry Etkin. Web Design by Kris Hjelmeland.

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