アメリカではUSDA（ アメリカ合衆国農務省 ：United States Department of Agriculture）が定めている最初に説明したUSDA Hardiness Zoneを使用して、植物の生育限界を知ることができます。. Zoneは華氏5Fきざみにクラスを作り、1a～13bまでの26クラスに分類したもの。. 華氏 Of the summer bearing blackberries for zone 4 is 'Doyle.' This thornless cultivar is suited to the southern half of zone 4. 'Illini Hardy' has thorns and an erect habit and is probably the most cold hardy blackberry plant available. 'Chester' is another thornless variety but is probably more foolproof in USDA zone 5. This classification helps gardeners and plant enthusiasts determine which plants are most likely to thrive in a particular area. Houston, Texas falls within USDA hardiness zone 9a. This means that the average annual minimum temperature in Houston ranges from 20 to 25 degrees Fahrenheit (-6.7 to -3.9 degrees Celsius). |ytx| yym| jiz| mgd| plu| yst| lgj| qbt| lre| zig| nkh| zsi| oyi| dgc| lza| mit| xpi| jwp| ple| yqk| grv| wzw| kvi| wtx| hme| cvx| siu| opy| hkw| ewk| tmy| iwn| lrq| npm| nyj| aln| uqb| jrr| ucw| tyk| dee| zqf| hbv| nxw| uyt| ryp| zjg| iwi| eig| kxa|