Snapshot 2.5 TG - 50 lb. bag Can be used in Peonie beds. It will only prevent seeds of listed weeds from germinating or multiplying.
Snapshot 2.5 TG sounds like the product you need and should do a good job for you. However, it is labeled for white clover since it is considered a broadleaf weed, so Snapshot would prevent the clover from germinating if planted from seed, as well.
Snapshot 2.5 TG is not labeled for use on your lawn.
We would recommend using Fertilome Broadleaf Weed Control with Gallery. This is safe for use on centipede grass and is a granular product. It is also labeled for pre-emergent control of dandelions, as well as other weeds.
The Snapshot 2.5 TG product manufacturer states that they do not know whether it would be safe to use over perennial peanut since it is not on the label. This article on Perennial Peanut in Urban Landscapes suggests spot-treating weeds with a Roundup-type product that is non-selective in this particular groundcover.
Mountain laurel is listed on the Snapshot 2.5 TG product label as tolerable to applications.
Snapshot 2.5 TG - 50 lbs. should not be applied around new plantings as it will prevent them from growing.
Snapshot 2.5 TG is a pre-emergent herbicide that needs to be activated with about 0.5 inches of rainfall or irrigation. If you are expecting extremely heavy rains, then it would be best to delay your application so that your barrier is not disturbed. Snapshot should be activated within 3 days of application for best results. Repeat applications at 150 lbs per Acre or higher should not be made sooner than 60 days, per the product label.
Snapshot 2.5 TG is labeled as safe to apply to some ornamental grass species. You can find a full list of grasses where Snapshot can be applied on the product label.
Yes, Snapshot 2.5 TG can be used in this type of area. Keep in mind that it is a pre-emergent, meaning it will prevent weeds from germinating, but will not kill any weeds that are actively growing.
Roundup would be good to use to kill anything in the bed now as well as spot treating with care on future weeds, then you could plant in 2 weeks and apply Snapshot 2.5 TG after planting for future prevention.
Since Snapshot is a pre-emergent herbicide and needs to be watered in, you want to be sure the area is not so dry or sloped that the product will not just run out of the area when you water it. You may want to use sprinklers, a hose, or a watering can to moisten the treatment area first to help the granules stay in place before activating with water.
Snapshot 2.5 TG is best applied directly to the soil and then watered in as it is a pre-emergent herbicide. If some granules get on the leaves during application, these should be knocked off if they do not come off after watering.
Snapshot 2.5 TG is applied at a rate of 2.3 to 4.6 lbs. per 1,000 sq. ft. Please see the product label for complete application instructions
Snapshot 2.5 TG - 50 lbs. does not list Nassella trichotoma as tolerant to an application. This does not appear to be something common to the US so the manufacturer does appear to have tested Snapshot around it.
You should not apply Snapshot 2.5 TG where you are going to put in new plants for at least one year, per the product label. You can apply around new transplants once the soil is settled by packing and irrigation or rainfall.
Snapshot 2.5 TG is not labeled to be used in lawns so would not be recommended over buffalograss. It is for use only in landscape ornamentals, ground covers, perennials, non-bearing fruit and nut trees, container grown ornamentals, non-bearing vineyards, field-grown ornamentals and non-cropland. For lawns you can use something like Pendulum.