April is the perfect time to seed fast-growing crops that thrive in cooler temperatures. In this Trustees of Reservations class on Saturday, April 18 from 10 – 12 at City Natives, 30 Edgewater Drive in Mattapan, we’ll talk about the best varieties and demonstrate growing techniques for an early harvest. Free, but registration required at http://www.thetrustees.org/things-to-do/greater-boston/event-1868.html? Radish sprout picture from www.natureswonderland.com.au.