Depending on your location, this winter/spring has been relatively dry. The watertable is lower than average and your plot has been covered in polythene. Watch for the next rain episode,(https://www.windy.com/-Rain-thunder-rain?rain,56.122,-3.159,4,i:pressure) remove the polythene. It should be OK to plant established plants straitaway. If critically dry , water them in thoroughly and consolidate.
Cleansweep
