Trial by Flower!!! 
"If we can't kill it no one can!"
Dallas Arboretum Trial Program
Plant of the Month 
by Jenny Wegley-Trials Manager
Lobularia 'Snow Princess', 'Frosty Knight' & 'Blushing Princess'

'Blushing Princess'. Photos courtesy of Dallas Arboretum.




Lobularia 'Snow Princess' and 'Blushing Princess'


Latin name:
Common name:
Sweet alyssum
Quarter-sized clusters of flowers
Mature size:
4-6" tall by 18-24" wide
Summer and fall annual
Moist soil
Full sun to part sun
Water usage:
High to medium
Local nurseries or mail order



Are you getting bored with mums, pansies, violas and kale for your fall garden palette? If they are becoming mundane to you, we have a new plant to try, hybrid Lobularia. These new hybrid forms of alyssum are much more vigorous and cold tolerant than the older varieties that have disappointed us before. The genus name Lobularia comes from the Latin name globulus, meaning small globe, and refers to the shape of the clusters of flowers. It's a perfect name for a plant that looks like a shaken snow globe.



'Snow Princess'


Three seasons ago, Proven Winners released the first vegetative Lobularia into the market. Before this, all Lobularia were grown only from seed. A vegetative product allows for a more vigorous plant with more flower power. Just one of these new plants can reach 2 feet across in a season. There are now three cultivars available. 'Snow Princess' was the first on the market, with narrow, dark green leaves covered in pure white, quarter-sized flower clusters. 'Frosty Knight' and 'Blushing Princess' are additions to this series this season. 'Frosty Knight' has white and lime-green variegated foliage with cream to white flowers. 'Blushing Princess' has the same characteristics as 'Snow Princess', but is covered in lilac flowers. Both are more compact than the original 'Snow Princess'. Plant them in containers to add a splash of cascading color, or use them in the landscape to add mounds of foamy white flowers, like a touch of baby's breath in a bouquet.



'Frosty Knight'


Plant in full sun to part shade, and water on a regular basis; all three cultivars are thirsty plants. Most likely you will find these only in 5-inch, quart, 1-gallon or larger containers. The price point will be slightly higher than that for a 4-inch seed cultivar, but you only have to buy a quarter of what you would normally buy, and the plants will last much longer in your garden. At the Dallas Arboretum, we've found that we can keep them all winter long if we cover with frost cloth when there is a heavy frost or freeze. For areas north of Dallas, I recommend these only for early spring or late fall color.  Zone 7 winters are their limit. From Waco south, you should be good for all-winter to late-spring color. We have found these varieties also are heat tolerant enough to last all summer if given constant moisture and a little late-afternoon shade. Be sure to buy these by name at the nursery. If you don't see 'Snow Princess', 'Frosty Knight' or 'Blushing Princess', avoid the temptation. The seed-grown varieties just don't perform as well for us Texas gardeners.



'Blushing Princess'



About the author: Jenny Wegley is the senior manager of trials and greenhouse at the Dallas Arboretum. Visit www.dallasplanttrials.org for more information on the Arboretum's trials.



 2012 Trial Garden Sponsors

The following business have dedicated funds, material and time to the improvement and continued growth of the

Dallas Arboretum Plant Trials Program.


Please thank our generous Trial Garden sponsors!



Syngenta Flowers &
Goldsmith Seeds
Proven Winners Gold 
Green Lake NurseryGoldPlatinum
SunGro HorticultureGold 
Plant Development Services Inc., Encore Azaleas &
Southern Living Plant Collection
Calloway's NurseryGold 
Scott's - Miracle GroGold 
Skagit GardensSilver 
Benary Seed Silver 
Living EarthSilver 
Master TagSilver 
Southwest PerennialsBronze 
Eason HorticultureBronze 
Berger Peat MossBronze 
Hem GeneticsBronze 
Texas Nursery & Landscape AssocBronze 
V&P NurseryBronze 
Emerald Coast GrowersCopper 
Jack KnoxCopper 
Jackson's Home & GardenCopper 
Jim ApkenCopper 
Kinney Bonded WarehouseCopper 
MagniMoist - A Think Mint Brand Copper 
Steve Dodd LandscapeCopper 
Steve's LeavesCopper 
Thompson & Morgan SeedCopper 
Greenleaf Nursery Platinum
Abbott-Ipco Platinum
GroLink Platinum
Florist Gerbera Gold
Jackson's Pottery Gold
Conard Pyle-Star Roses Silver
Weeks Roses Silver
Ball Horticulture - PanAmerican - KieftPro- BallFlora Bronze
Deep Fork Tree Farm Bronze
Syngenta Flowers Bronze
D&H Tree Service Copper
Takii Copper


Jimmy L. Turner
Senior Director of Gardens
Dallas Arboretum