I am happy to see how many veggies can grow underneath a small 6 sqm polytunnel.
Right now plants are not doing better than the outside ones, but it's a good insurance in case of bad weather.
Since I do not mulch anymore here (plants are very close), irrigation is automated and I don't have to worry about bad weather... is basically a 1 day job and don't think about it again until food is ready!
@Surasanji higher temperature, protection from wind which may dry out the soil and the leaves, from strong rain and hail, keeps more moist. It's a greenhouse basically.
On the down side, since there is a little airflow, fungal diseases can spread more easily, so can damaging insects... I keep the ends open unless there is a major bad weather in sight.
Here in the winter is not usually that rough, but you know, #climatechange . I lost quite some harvest in a storm a month ago.