Cucumber with parthenocarpy can be selected, that is, the greenhouse cucumber type in the Netherlands, without pollination.

Tomato, pepper and eggplant are all self-pollinated crops, and artificial pollination is not needed.

Leafy vegetables, roots, cauliflower, etc. No need for artificial pollination.

Watermelon and zucchini need pollination, but there are not many melons per plant, so it is easy to carry out artificial pollination.

In addition, there are some plant growth regulators that can promote fruit setting, and fruits and vegetables planted in greenhouses can be sprayed to prevent falling flowers and fruits.

You can rent a box of beekeeping bees, which is quite easy to find. You can put it in the greenhouse every morning, and you can change two sheds and one box every day.

If you grow fruits and vegetables, use this method. Insect pollination grows better than artificially pollinated fruits and vegetables.

If you grow leafy vegetables, you don't have to pollinate them.

If there are no bees, completely rely on artificial pollination and sweep the flowers with a brush (dip in powder).

To keep warm, at present, it is mainly to cover the greenhouse with a thermal insulation quilt, put it away in the morning to let the greenhouse receive sunlight, and put it down after 3-4 noon to keep the greenhouse warm. There is also a composite shed film, which has two layers and multiple layers, and the cost is relatively high.