chap. VI.] THE KITCHEN-GARDEN. 153 
replanted. As the sets are planted in March, 
and the leaves seldom begin to appear till 
the following June or July, it is customary 
to sow a light crop, of lettuce for example, 
or spinage, on the surface of the ground over 
the horse radish sets; which crop is cleared 
off in time to make way for the leaves of the 
true crop. When the sticks of horse-radish 
are taken up, they' may be kept in sand in a 
cellar or out-house till wanted for use. 
Temporary Crops, and their Rotation. 
—It has been already observed, that tempo¬ 
rary crops should never be grown two years 
in succession on the same ground; and the 
reason for this has been already alluded to 
under the head of transplanting. It is, that 
the roots of plants every year throw out a 
quantity of excrementitious matter that they 
either will not reimbibe, or that is injurious 
to them; and that thus, the ground in which 
they have been grown one year, becomes 
unfit for them to grow in the next. This 
danger is obviated in the case of perennial 
plants, and trees and shrubs, by the constant 
elongation of the roots, which spread farther 
and farther every year, beyond the influence 
