Can I change the price or days to maturity of several plantings at once?

Yes, in one step instead of one planting at a time. Open Actions, then Multi-edit, and tick the plantings. Click Multi-edit in the bar that appears, choose a value under Select value to edit, such as the price or the days to maturity, then Apply.

Only the values the selected plantings share are offered. Plantings using climate-adjusted days to maturity keep theirs, and Heirloom tells you how many. A change that makes plantings overlap on the Crop Map takes them off their beds.

The steps are in Manage your plantings.