. Plant propagation; greenhouse and nursery practice. ge, poplar, raspberry, trumpetcreeper, dracaena, horse-radish, plumbago, bou-\ardia). The roots arecut in pieces usuallythree inches long, eitherstored in moist moss orsawdust or placed di-rectly in the propagatingbed. With most coolclimate plants the rooting is done out of doors withoutartificial heat; with warm climate subjects bottom heatin greenhouse or hotbed is required. Plants in the formergroup are often handled with bottom heat to get bestresults or shorten time. Blackberries and red raspberries, especially when stock is


. Plant propagation; greenhouse and nursery practice. ge, poplar, raspberry, trumpetcreeper, dracaena, horse-radish, plumbago, bou-\ardia). The roots arecut in pieces usuallythree inches long, eitherstored in moist moss orsawdust or placed di-rectly in the propagatingbed. With most coolclimate plants the rooting is done out of doors withoutartificial heat; with warm climate subjects bottom heatin greenhouse or hotbed is required. Plants in the formergroup are often handled with bottom heat to get bestresults or shorten time. Blackberries and red raspberries, especially when stock isscarce, are often increased commercially by root cuttings (Fig 98).Roots one-fourth inch or even smaller in diameter are dug infall, cut in pieces one to three inches long, packed in green saw-dust or moist sand, stored in a cold ])ut frost proof cellar tillspring and the callused ones then planted like peas, not closer thanan inch asunder in furrows wide enough apart for horse cultiva-tion. They make salable plants by fall. When an extra demand 111. FIG. 98—BLACKBERRY PLANTSA, root-cutting plant; B, sucker plant.


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