With the preen, I use more than the photo on the inside label shows you to use and I think that's why that has helped so much. With the 2-4-D, a lot of people use it or have tried it in their daylily beds (conversation from email Robin) and 50% will tell you it will hurt (not kill) the daylilies and 50% will say it doesn't. It's not supposed to since daylilies are monocots and it's designed for dicots. Maybe they mix it at different strengths. At my old place I did spray a patch of grass (20' x 40') in front of one of my beds before because I was tired of the dandelions and such and any that may have drifted or splattered on the daylilies didn't seem to phase them.
Snapshot is expensive when you shell out the money at one time. I've heard some people say they've gotten it for around $70 for the 50lb bag but I think most people are going to pay $125.00 or more. That's actually inexpensive considering how much is in it and how often you apply it. Snapshot is supposed to last up 8 months whereas Preen lasts up 3 months. In the long run it pays off. There is another product that is the same ingredient as Preen (trifluralin 1.47%), but in a higher strength (5.0%). It's called Treflan 5g and I think most people say they get it for around $50 for the 50lb bag at the John Deer store or places like that. We can get if from BWI (I believe), but we stick with the Snapshot (triflualin 2.0% & isoxaben 0.5%)
I think that some people (not on here
) use these products and think they don't work because they still get weeds. The thing with these products is they keep seeds from germinating. If the seed has already germinated (but not emerged yet) it will still grow. If any leftover weed roots from some types are still there it can regrow. If any weeds that have been pulled are left behind (maybe under the soil) it can regrow. And there are just some weeds these things don't affect.
