Weed Control for Evergreen Trees: Roundup is a popular, effective and widely available herbicide, but it kills EVERYTHING, so use with caution. To make an “after planting” spray barrier, you can cut the bottom off a 2 liter [or cut a length of PVC pipe or carpet tube], slide that over each tree until it is flush with the ground, and then carefully spray around the 2 liter…but be careful that the Roundup doesn’t drip off the 2 liter and onto the tree as you remove it. It is also important to avoid creating a fine mist which can blow onto the trees by the wind. Set the sprayer to produce droplets which fall to the ground.
Weed Control for Evergreen Trees: Treflan, Biathlon is a pre-emergent weedkiller, meaning it does not kill germinated/growing plants. Apply Treflan to bare soil around each tree and then cover treflan with mulch or sawdust to create an effective barrier against weeds and a good insulator against moisture loss.
There are commercial post emergent herbicides which can be directly applied to evergreens without hurting them, Fusilade II, Grass killer Vantage, Goal 2 XL. Goal is quite popular in the wholesale industry.
For best results, integrate both pre-emergent and post-emergent weed control methods when caring for evergreen trees. After planting, consistently monitor the area for weed growth and reapply herbicides as needed, following all label directions carefully. When using a product like Roundup, always protect the base of the tree and avoid windy days to prevent accidental spray drift. Mulching plays a crucial role in weed suppression and moisture retention—apply a 2–4 inch layer around each tree, ensuring it doesn’t touch the trunk. Pre-emergents like Treflan or Biathlon are highly effective when used in combination with mulch, especially in newly planted areas. For grassy weed issues, Fusilade II or Vantage offer selective control without harming your evergreens. For broader weed control, Goal 2 XL is a trusted choice among professionals. Always wear protective gear and consider using spot sprayers for precise application. This approach helps maintain a healthy, weed-free environment for your evergreen trees.
