If you are going to try this chuck it over idea, then I would start some
seeds in 4inch pots of soil (Not a light compost), and then when they have a
good root system, cut them back and on a good wet day throw then over
(without their pots), then given some luck and a few damp days the roots may
get into the soil.
At least this way there is les chance of you just feeding the mice.