spring; which season is to be preferred should
be determined chiefly by the character of the soil. On soil much given
to heaving in the winter it is usually preferable to sow in the spring.
In all, or nearly all, parts of Canada spring sowing only is admissible.

When the seed is sown in the early spring, it should usually be sown
quite early, as early, in fact, as the ground is in condition to receive
the seed when the nurse crop has been sown the previous autumn. When the
ground is smooth and impacted on the surface, it is considered
preferable to defer sowing until the ground is dry enough to admit of
covering the seed with the harrow. When deposited at the same time as
spring-sown nurse crops, and with these, the time of sowing will be
determined by the most suitable time for sowing the nurse crop. This
plant may be sown under certain conditions as late in the spring as
moisture exists in the soil sufficient to produce vigorous germination
in the seed. This means that it may be sown as late as June, if sown
alone, and even later. When sown thus late it should be on soil that has
been well cleaned near the surface. When sown in the autumn, as with
medium red clover, the aim should be to put the seed in as early as the
arrival of the autumn rains, that the plants may be well rooted before
the arrival of freezing weather.

Ordinarily, mammoth clover, like the medium red, is sown with a nurse
crop, whether sown fall or spring. (See page 84.) The nurse crops in the
North include winter rye, winter wheat, barley, spring wheat and oats,
suitable, probably, in the order named, also such pasture crops as rape,
vetches, and various mixtures of grain sown on certain soils to provide
pasture for cattle, sheep or swine. The best nurse crops in the South
include winter rye, winter barley and winter oats, even though the seed
should not be sown on them until the spring. On certain sandy loam soils
a stand of mammoth clover is more assured if sown with a pasture crop
than if sown with a grain crop which is to mature. (See page 82.) Under
certain conditions of soil and climate, this crop may be sown on plowed
or disked land in certain of the States, after a crop of grain, and in
other instances by sowing amid the stubbles and covering with the
harrow. But there is more of hazard in growing thus than by other
methods. Sometimes this clover is sown amid standing corn, at the last
cultivation, but too much shade or too little moisture