Each section of the world can effectively grow specific kinds of plants. You may think that in a tropical or subtropical region you can grow anything you want, but that’s not at all the case. There are plants that prefer cold climates and require a cold winter with a hard freeze in order to grow well the next season or for their seeds to be viable in the Spring.
All I have to say is thank goodness for the internet and all the updated information I have at my fingertips when I need it. For years and years I thought I was in Zone 5b. Thanks to some research and noticing of recent changes I’ve now found that I’m in Zone 6a! This does a few things for me as a gardener. It slightly extends my growing season an makes new plants available as perennials or hardy annuals in my region. Based on this I’m a few more weeks behind in my planting schedule than I originally thought. So I’ll probably be visiting the local greenhouse to buy some plants again this year instead of planting them all from seed like I’d planned.
This is a current USDA Plant Hardiness Zone Map split into half zones. This just means it shows the A & B portion of each zone, very important when only a few degrees of hardiness counts.
If you live in the US you will appreciate this zone map tool provided by the Arbor Day Foundation. This tells you what zone your part of the country is in to help you determine what can be grown in your area and when –