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Monarch Magic Floss Flower
Ageratum houstonianum 'Agerboyuma'
Spreading flossflower with blue-violet clusters that draw butterflies from spring into summer.
- Plant Type
- Annuals
- Width
- 8–16 in.
- Height
- 6–12 in.
- USDA hardiness zone
- 9 - 11
- Sun requirements
- Full Sun, Part Shade
- Water requirements
- Medium
- Design image count
- 4
Design images (4)




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Create design onlineAbout Monarch Magic Floss Flower
Monarch Magic™ is a spreading flossflower selected for blue-violet flower clusters and a long season of color. Ball FloraPlant identifies its cultivar denomination as 'Agerboyuma' and lists the species as *Ageratum houstonianum*; its compact scale suits borders, patio containers, and mixed baskets.
## Flowers and landscape use
Fluffy clusters flower from early spring into summer in the breeder’s schedule, and the flowers attract butterflies. New blooms cover older ones, so routine deadheading is not needed for continued display. For the breeder's exact size and exposure guidance, see the [Monarch Magic™ product profile](https://www.ballfloraplant.com/Products/Details/?phid=001800001053193).
## Growing conditions
Ball lists plants at 6–12 inches tall and 8–16 inches wide, with sun to partial sun. [NC State Extension](https://plants.ces.ncsu.edu/plants/ageratum-houstonianum/common-name/ageratum/) recommends full sun and rich, moist soil with good drainage, and notes that flossflower is frost-tender. Keep moisture even rather than letting plants dry hard. Powdery mildew can occur, especially where air movement is poor. The species is treated as a tender annual in most gardens; USDA zone values in a catalog should not be read as a cultivar hardiness claim.
## Breeder and patent record
Ball FloraPlant markets the cultivar as Monarch Magic™ and lists plant protection number PP36,798. The registered cultivar denomination is 'Agerboyuma'; the product profile records that identifier without stating current legal status. Ball Seed's [plant information page](https://info.ballseed.com/PlantInfo/?phid=001800001053193) adds bloom-season and water details.
## Maintenance
Plant after frost danger has passed. Water during dry spells and feed according to container or bed needs. Deadheading is optional: it is unnecessary for bloom renewal, though removing tired stems late in the season can tidy the display. Remove plants after frost.