Please message the mods here if you have any good resources and links for your country

• Australia - Plant Hardiness Zones
• Australia - Native Plants
• Australia - Botanical Garden Database
• Africa - Native Plant Database
• Europe - Euro+Med Plantbase Project
• New Zealand - Department of Conservation Native Plants List
• New Zealand - Flora's Native Plant Database

• Plant Hardiness Zones
• Royal Horticultural Society's Native Plant Database
• Royal Horticultural Society - planting a wildflower meadow guide
• RSPB - Planting a wildflower meadow guide
• Landlife Wildflowers - Native Plant Supplier
• Natural History Museum - How to grow a better lawn for wildlife
• The Woodland Trust - Native trees for wildlife
• Real Seeds - Natural and heirloom fruit and vegetable seeds

• United States - Broken up by State w/Additional US Resources and Zone Maps (Reddit link)
• USDA Plants Database
• United States & Canada - Pollinator Conservation Resource
• BONAP Native Plants Atlas
• GrowNative for the Lower Midwest
• BP Plant Database Plant Ecology and Identification (for North America)

• Canada - Interactive Plant Hardiness Zones
• Canada - Plant Hardiness Zones
• Canada's Plant Hardiness Site
• Tree Planting Guide Tree Canada
• Eco Regional Planting Guide
• Canadian Council on Invasive Species