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USDA Hardiness Planting Zones

To determine if a plant is sufficiently cold-hardy, the USDA created numbered zones indicating winter low temperatures; the lower the zone number the colder the winter.

  • If the coldest winter temperature expected in your area is -15°F (zone 5) then any plants rated zones 3-5 will survive the winter temperatures in your area.
  • If you live in very warm winter areas (zones 9-11) plants with zones 3-4 ratings are not recommended. The lack of freezing winter temperatures do not provide a time for winter dormancy (rest).

When to Plant Flower Bulbs: Tropical

Region "H" — Tropical

Optimum Planting Time:

December 1st - January 31st

USDA Hardiness Zone:


Your climate seldom if ever gets a frost and has hot humid summers. It is the ideal climate for a vast assortment of summer-blooming, tropical bulbs, but not particularly hospitable to the traditional hardy spring-flowering bulbs, such as tulips.

General Instructions:

The range of lush tropical bulbs available to you is mind-boggling ("to die for" as some Northerners would say!). But hardy spring-flowering bulbs, such as tulips are a fish out of water in your neck of the woods. Still, if you crave seeing tulips in spring, check out your local garden retailer or florist for pots of nursery-grown tulips and other traditional spring bloomers.

Special Note: > The group of bulbs below are from warmer climates that do not require much if any cooling. Hippeastrum (amaryllis), which thrive in hot, humid climates, make perfect 'tulips for the south' with their sturdy stems and large velvety flowers in a broad range of colors (including stripes!). In general, in areas where the garden isn't far above sea level, raised beds can improve drainage after hot, humid, summer storms.

A Sampling of Flower Bulbs for Perennializing (Return for Several Years):

A Sampling of Bulbs for Naturalizing (Return & Multiply):

Shop for Fall Bulbs

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