It seems winter all happened in one week in February, then bam...spring temperatures arrived! Spring officially begins on March 20th this year, which is normally the first day for planting new sod, and landscape perennial plants. However, some summer vegetables can be planted much earlier,
see guide. Realize some of the
extreme cold damage on plants is already visible, but they may not be dead, just damaged. Before replacing, wait a little while to see if new growth emerges on shrubs, trees, and perennials. The turfgrass normally does not really green until late April to May, and you should not do anything to grass now. Normally you would use
Pre-Emergent type herbicides now for summer weeds, but most experts are saying not to use it especially on St Augustine grass. Some varieties of St. Augustine may suffer from the cold injury--it is a wait and see for now. If you have already used these in the week before the cold, just hopefully the snow had some blanket effect. It will be late April to May to be able to know if it survived, so just wait.
View Turf Talk for more information on lawn care.