A farmer sows his crop in the foreground, while behind him horses are used to harrow the soil -- break it up in preparation for sowing. From the Roxburghe Ballads. University of Victoria Library.

Tusser's calendar for Spring:

Sow barley in March, in April, and May,
The later in sand, and the sooner in clay.
(Wheat was sown in the autumn, in September and October.)

March:
White peason sow,
Scare hungry crow.

April:
One day ere ye plough,
Spread compost enow.

The Church calendar was a convenient way of remembering what should be done when, even when it came to the timing of bringing bull and heifer together:

From bull, cow fast Till Crouchmas be past,
From heifer bull hide thee
Till Lammas doth bid thee.

Lammas
1st August, originally celebrated as a Harvest festival.
Crouchmas
The festival of the Invention [finding] of the Cross (May 3). The mother of the Christian Emperor Constantine was supposed to have found the Cross on this day.

More activities in Spring. . .