Ask a Question
Notify Me On Question Update
Email this Question
What is a pre-emergent and a post-emergent?
Rate This FAQ
A pre-emergent herbicide kills plants as they emerge (seeds) from the soil, and a post-emergent works after the plants are growing. There are non-selective herbicides (kill all plant life) and selective herbicides which either kill only broadleaf or only grassy plants. Carefully read instructions on chemical container so herbicide damage will not occur on plants that are near by in the landscape.
Submit Your Suggestion
Other Questions In This Topic
- How invasive are globe willows? Also, what is the distance they should be from the septic system and water lines, etc?
- I have a 25-foot tall scrub oak that appears to be dying. If it is anthracnose that is killing it, can it be saved? There are some commercial, injectable products that claim success. Is it possible?
- My lawn is really struggling with the heat and drought. Is there a point when it just won't recover?
- I made the mistake of fertilizing my newly planted trees. I had heard that the salty, clay soil I have needs iron useable for the trees. I used chelated. Anyway two of the trees, a candian red cherry and a zelkova tree have dry crispy leaves on the north side of the tree. We have had very hot, windy weather. I have two other canadian cherries that look fine.
- I have a very large, beautiful Cottonwood tree on my property, that is near the property line with my neighbor. She wants to put in a new fence, because the tree has been pushing up the posts for her old fence. The fencing company has said that they can put in a new fence, but they will have to "shave off" a bit of the tree trunk and possibly some of the root near the surface of the ground. I am worried that something like that could lead to the tree getting sick or dying. I want to keep peace among neighbors, but it would be a disaster and very expensive to lose the tree because of something likethis. Can you please tell me if a Cottonwood tree is hardy enough to withstand such a "shaving" procedure?
- I have several Dwarf Blue Arctic Willows in my yard. This year they were full of some kind of wasp or bee. I waited until winter and the leaves dropped off to see if there was a hive or nest and there does not seem to be one. In looking for the nest I noticed some small black bugs on the wood. What should I do, if anything and are the two pests related in any way?
- Our scrub oak is taking over our view, but efforts to trim have resulted in visible cuts and dead branches near the cuts. Do we need a professional, or can it be done well by a lay person?
- I live on 25 acres on the border of Summit and Wasatch Counties at an elevation of 7,000 ft. I need to add some trees to the landscape both evergreen and shade? What are good choices for my high and cold location?