Usda Plant Zones 2024. Department of agriculture has an updated plant hardiness zone map. — usda’s plant hardiness zone map is the standard by which gardeners and growers can determine which plants are most likely to thrive at a location.
— after initial testing, they repeated the experiments and added different levels of shade, as many foresters will be planting under mature ash canopies. — the firebush is resilient in usda hardiness zones 9a to 11 and can reach heights of 8 to 12 feet.