yew, but vegetables are incomplete proteins, you would also have to have different food sources. you need a balanced diet to stay healthy, you would need at least something from each of the food categories, because if you dont have something from each you'll have problems, like brittle bones and bad muscle function from lack of calcium, scury from lack of vitamin c, and immune system trouble from lack of complete proteins. and since we will be isolated for a long time we need to solve that problem.
so growing vegetables, what else? maybe livestock? goats, cattle, chickens (would be very easy to keep).
ohh and incase of absolute emergency, such as the virus going airborne, we will all evacuate to antartica, its to cold there for the virus to be active, and its very very isolated, theres plenty of penguins to eat along with fish, and we could dig shelters into the ice and snow. and melt the snow for water. but this is a last option thing, and still an idea.