Servicing the Mpls/St. Paul metro through 5 area offices:    Eden Prairie (952) 941-2900 | Burnsville (952) 890-6655
Woodbury (651) 735-4422 | Plymouth (763) 383-7655
New Brighton (651) 633-9892


 

               

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Testimonials

Joan from New Brighton says:

05/02/11 06:10 PM

I have used Guaranteed since the early 90's and I have enjoyed watching there company grow without compromising the service they have provided to us! we love supporting our local companies

 

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Refer a Neighbor... or a Friend

Receive one free Fertilizer and Weed control application on your next service when you refer a neighbor or a friend to Guaranteed Turf Care and they sign up for our Nature Green or Weekender Mowing program.

Thistles are warm season broadleaf weeds that can be a nuisance in many Minnesota lawns. There are two different types of thistle: perennial and biennial. The most common biennial thistles in our area are the bull and plumeless. The most common perennial thistle in our area is the Canadian thistle. Biennial thistles can be controlled by digging and cultivation; however, this is more difficult with perennial thistles because they spread by creeping underground stems (rhizomes).

Biennial thistles live for two years. The first year they form a low-growing rosette of leaves, and the second year a taller, flower and seed bearing stem. Biennial thistles are most effectively controlled the first year when they are in the rosette stage.
 

Bull thistle reproduces by seed and can be found throughout Minnesota. The stem is heavily branched and may be 2 to 4 feet tall. Leaves are green on both upper and lower leaf surfaces (the lower surface somewhat paler than the upper surface) with yellow tipped spines. Leaf bases run down the stem giving it a winged appearance. Compact rose to reddish purple flower head, 1 to 2 inches in diameter, bloom from June through September.  

  

Plumeless thistle may be found in most areas in Minnesota, except in the northeast arrowhead. The stem (3 to 6 feet tall) is erect. Leaves are deeply divided with alternate lobes ending in white to yellowish spines. Leaves at the base of the plant and lower stem are large and decrease in size as they progress up the stem. Leaf hairs are scattered on the upper surface, but are denser on the lower surface especially along the mid-vein. Single or loosely clustered, reddish-purple flowers are globe-shaped, 0.5 to 1 inch in diameter, with spiny wings to the base. Flowers bloom in late May through early July.   

 

 


Perennial Thistles come back each year from roots that survive the winter. They bloom and seed every year. The most common is the Canadian thistle. Canada thistle reproduces both by rhizomes and from seed. Roots can extend horizontally and vertically several feet. Stems are 2 to 5 feet tall, branching only at the top. Leaves are somewhat lobed and crinkled at the edges with spiny margins. Numerous, compact, lavender disk flowers, 3/4 inch or bracts surround less in diameter.  
 
The most effective way to remove thistles is through the use of herbicides. Broadleaf herbicides containing 2,4-D and MCPP can have good success in controlling thistles in lawns. Herbicides must be applied when weeds are actively growing and air temperatures are roughly 60º to 85º F. The best times to control weeds are in the spring (late April through mid-June) and the fall (September through mid-October).    
 

  
 

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