Answer:
According to the excerpt, harvest happens:
3. from spring to early winter.
Step-by-step explanation:
Although the excerpt mentions the harvest moon, which happens in October, during fall, it also mentions the following:
"but actually we are 'bringing in the sheaves' from the first dandelion we snare in April to the last kale or collards or brussels sprouts we brush the snow from before we take it into the kitchen."
Notice that the lines above mention crops or plants harvested in spring as well as early winter. By April, the author refers to spring, but "brush the snow", to winter. Harvest happens all year long, except for later in the winter, when it is no longer feasible. Therefore, the best option is:
3. from spring to early winter.