What should the newly grafted saplings do when it rains?

Wrap the graft tightly with plastic wrap. It's okay. Be sure to wrap it tightly. If the bag is not sealed, water will go in. Will greatly reduce the survival rate, as long as the package is tight.

Don't touch the bud stem with your hands after the rain stops. Most of them will fall off when touched, but they are actually in stock. The bud ratio of Osmunda is small and dry, so don't buckle it by hand just because the bud is not alive. Those who can live like this will not live.

Extended data:

Grafting is one of the artificial propagation methods of plants. That is, the branches or buds of one plant are grafted to the stems or roots of another plant, so that the two parts connected together grow into a complete plant. Grafting methods are divided into branch grafting and bud grafting. Grafting by using the function of injured callus of plants.

Grafting is a kind of vegetative reproduction in asexual reproduction. When grafting, the scion should be closely combined with the cambium of rootstock to ensure the survival of the scion. Grafted branches or buds are called scions; Grafted plants are called roots or edible wood. Generally, seedlings with 2 ~ 4 buds are selected as scions, which become the upper part or top of the plant after grafting, and rootstocks become the roots of the plant after grafting.

References:

Baidu encyclopedia-grafting