SMALL GREENHOUSES 9 



hardy. They are not injured by a light frost, nor by 

 extremes of temperature or sudden changes, nor by a 

 direct transfer from greenhouse to open air conditions 

 without previous hardening off. It is true, however, 

 that we can force more rapid growth at a compara- 

 tively high temperature, ranging say between sixty 

 and ninety or more degrees Fahrenheit, than in a 

 much lower one. 



One of my friends, near a neighboring city, who 

 has grown several acres of Prizetakers on the new 

 plan yearly for several years, has taken another course 

 to secure his hundreds of thousands of plants. In his 

 vicinity lives a party who makes a business of growing 



Fig 9 SMALL GREENHOUSE CROSS SECTION 



annually a million or two of tomato plants under con- 

 tract for some large canning houses which supply the 

 plants to their tomato growers. Some of the green- 

 houses in which these plants are grown usually stand 

 empty until nearly the time that onions can be taken 

 off the benches and set in open ground. A crop of 

 onion plants may here be produced just as well as not, 

 and with but slight additional expense. So my friend 

 contracts for his plants with these tomato plant grow- 

 ers with profit to both parties in the transaction. 



In my own little greenhouse I have for many years 

 done exactly as these professional plant growers do, 

 namely, have grown my onion plants during the win- 



