Dames' rocket (Hesperis matronalis) is a biennial plant of the mustard family that reproduces only by seed. Dames rocket is a flowering biennial that was introduced in North America in the 1600s. Looks can be very decieving! The best way to remove an infestation of dame's rocket depends on when in its lifestage the work is taking place, Renz noted. Dame’s Rocket can be easily controlled with several herbicides including Glyphosate (Roundup). Second-year leaves: Lance-shaped, finely toothed, and alternate with short to no leaf stalk (sessile or with a very short petiole). - Prune back faded blooms and dying foliage in … Fragrant, especially at night. Control. Revised:  5/10/2010 Repeat control measures for a few years until seeds in the soil are depleted. The big problem with Dame's Rocket is that it is being used as a cheap filler in many "wildflower" mixes and additionally, even people with the best intentions have not been able to control its seed production. Control: Removal: Remove rosettes. Heavy fertilizer and moist, well-drained soil will help nurture this flower. You can cut the flower heads off established plants after bloom so the plants do not set seed, or hand pull the plants. Controlling Dames Rocket Pulling Dames Rocket. Dames rocket has alternate, lance-shaped leaves with serrate margins. It quickly escapes cultivation because of its prolific seed set. Fruits & seeds: Abundant; produced in long, narrow seed pods (siliques), up to 5” long, that are constricted between seeds and break apart lengthwise at maturity. CONTROLLING DAME'S ROCKET Dame's rocket has not been studied extensively. The plant’s three-month-long blooming period and ability to set abundant seed have contributed to its spread, as well. It may be sold in garden centers as a perennial and is often included in “wildflower” seed mixes. Generally, pulling the plants right before flowering is especially effective, though it may take several … DISTRIBUTION AND HABITAT: Dame's rocket is native to Eurasia but was introduced to North America in the 1600's. Not only is it beautiful, but it is very easy to grow from seed. Dame’s rocket bears loose clusters of attractive, fragrant, pinkish-purple to white four-petaled flowers on 2 to 4 ft. stems. Control and Management: Locating and removing plants immediately before seed sets is the best way to prevent the spread of dame's rocket. You can cut the flower heads off established plants after bloom so the plants donot set seed, or hand pull the plants. Herbicide: Growth: Vegetative: Flowering: Seed It is native to Eurasia and has an appealing fragrance that is more pungent in the evening than during the day. Dame’s Rocket is also very resilient and can be successfully planted in both sun and shade. Dames Rocket should be fall planted in an area where it will receive full sun or partial shade. Species Assessment Groups (SAG) were assembled to recommend a legal classification for each species considered for NR 40. Avoid getting the herbicide on other plants. The Dames Rocket flower resembles phlox, but it belongs to the mustard family. To limit spread, pulled plants should be burned or disposed of in the trash. Because it can spread rapidly, you should think twice about planting it in your garden. Mowing is not an effective means of control for Dames Rocket in most cases. It was introduced to North America in the 1600’s and has naturalized itself in moist, wooded areas, but can also invade open areas. Avoid getting the herbicide on other plants. - Use an herbicide rotation, because Dame’s Rocket appears to develop resistance quickly. It was introduced to North America in the 1600’s and has naturalized itself in moist, wooded areas, but can also invade open areas. 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