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Best Plants to Grow in Different U.S. Hardiness Zones

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Understanding Hardiness Zones

The USDA Hardiness Zones map the United States based on average annual minimum winter temperatures. They range from Zone 1 (coldest) to Zone 13 (warmest). Knowing your zone helps you select plants that can survive your winter temperatures. While winter hardiness is important, remember that summer heat, humidity, soil type, and drainage also affect plant success. See what Rescape AI can do—and how it can generate yard design images here based on your style—Sign Up Here or learn more about Hardiness Zones by reading on.

Here’s a quick reference for the zones we’ll focus on:

With this context, let’s explore plant recommendations for each zone, emphasizing what thrives in your climate rather than focusing solely on cold tolerance.

Zone 6: Cold-Winter Gardens

Zone 6 experiences cold winters, so plants need to withstand frost but can also handle a moderately long growing season.

Beautiful purple Hibiscus in bloom
A purple blue Hibiscus

Zone 6: Trees

  • Cornus kousa (Kousa dogwood) – Stunning spring blooms and fall foliage.
  • Cercis canadensis (Eastern redbud) – Early spring pink flowers brighten the garden.
Dogwood Tree
Kousa Dogwood Tree
Eastern Redbud Tree in Summer
Eastern Redbud Tree

Zone 6: Shrubs

  • Buxus. (Boxwood) – Evergreen structure and winter interest.
  • Hibiscus syriacus (Rose of Sharon) – Summer blooms and long flowering season.
  • Spiraea japonica (Japanese spirea) – Easy-care flowering shrub with vibrant colors.
Boxwood shrub
Boxwood
Japanese Spirea
Japanese Spirea

Zone 6: Perennials

  • Hostas – Shade-loving foliage with elegant flowers.
  • Achillea millefolium (Yarrow) – Drought-tolerant with long-lasting blooms.
  • Hemerocallis (Daylillies) – Low-maintenance flowers that return every year.

Tip: Plant in spring or fall for best root establishment. Use mulch for winter protection and combine shrubs, perennials, and evergreens for multi-season interest.

Flowering Hosta
Hosta
Hemerocallis flower
Hemerocallis

Zone 7: Transitional Gardens

Reddening Autumn Leaves
Zone 7 has milder winters, giving gardeners more flexibility. Many plants that are borderline hardy in colder zones will thrive here.

Zone 7: Trees

  • Acer rubrum (Red maple) – Brilliant fall colors and adaptable growth.
  • Magnolia grandiflora (Southern magnolia) – Iconic evergreen with fragrant flowers.
Acer Rubrum Leaves
Acer Rubrum
Southern Magnolia Flowers
Southern Magnolia

Zone 7: Shrubs

  • Gardenia jasminoides – Fragrant white flowers; choose “hardy” cultivars.
  • Rhododendron – Acid-loving, vibrant blooms in spring.
  • Nerium oleander – Hardy in sheltered spots, great for warmer microclimates.
Rhododendron
Rhododendron
Gardenia Jasminoides
Gardenia Jasminoides

Zone 7: Perennials & Annuals

  • Lavandula (Lavender) – Fragrant, drought-tolerant, attracts pollinators.
  • Phlox – Bright summer blooms, works in beds or borders.
  • Tagetes (Marigolds) – Easy annuals for color and pest control.
Phlox
Phlox
Tagetes (Marigolds)
Tagetes (Marigolds)

Zone 8: Warm-Winter Gardens

Nerium Oleander
Zone 8 enjoys mild winters and long growing seasons, ideal for both native and subtropical plants. The main challenge is summer heat, so choose heat-tolerant species.

Zone 8: Trees

  • Quercus virginiana (Southern live oak) – Evergreen shade tree, iconic southern species.
  • Taxodium distichum (Bald cypress) – Thrives in moist soils, excellent for wetlands.
Southern Live Oak
Southern Live Oak
Bald Cypress
Bald Cypress

Zone 8: Shrubs

  • Rhododendron indica (Indian hawthorn) – Compact shrub with pink blooms.
  • Gardenia jasminoides (Cape Jasmin) – Works well in warm winters for fragrant blooms.
  • Nerium oleander – Tolerates heat and poor soils, blooms almost all summer.
Rhododendron indica
Indian Hawthorn
Gardenia Jasminoides
Cape Jasmin

Zone 8: Perennials & Annuals

  • Lavandula (Lavender) – Excellent for borders and pollinator gardens. And Cottage Gardens
  • Achillea millefolium (Yarrow) – Tolerates heat and low water.
  • Vinca (Catharanthus roseus) – Colorful annual for sunny spots.

Tip: Use mulch to protect soil moisture during long summers, and plant in areas with some shade if afternoon sun is intense. Containers allow you to move tender species during extreme heat.

Vinca Flowers
Vinca Flowers
Lavender
Lavender

Zone 9+: Subtropical & Tropical-Friendly Gardens

Ixora Coccinea
Zones 9 and above experience very mild winters, allowing you to grow subtropical or tropical plants. Summer heat and drought tolerance become more important than winter hardiness.

Zone 9+: Trees

  • Jacaranda mimosifolia – Striking purple blooms in late spring.
  • Citrus trees – Lemon, orange, lime, and grapefruit thrive outdoors.
Jacaranda Mimosifolia
Jacaranda Mimosifolia
Citrus Tree
Citrus Tree

Zone 9+: Shrubs

  • Hibiscus rosa-sinensis – Large tropical blooms, ideal in sunny spots.
  • Bougainvillea – Vibrant flowers, drought-tolerant once established.
  • Gardenia jasminoides – Fragrant blooms, ideal in warm climates.
Bougainvillea
Bougainvillea
Hibiscus rosa-sinensis
Hibiscus rosa-sinensiss

Zone 9+: Perennials & Annuals

  • Plumbago auriculata – Blue flowering perennial climber.
  • Ixora coccinea – Heat-tolerant flowering shrub.
  • Tropicals in containers – Cannas, gingers, and annual coleus for seasonal color.

Tip: Even in warm climates, consider irrigation and mulching to prevent summer stress. Position plants for wind protection and good airflow to avoid fungal issues.

Plumbago auriculata
Plumbago auriculata
Ixora coccinea
Ixora coccinea

Conclusion

Choosing plants based on zone-specific recommendations helps ensure your garden thrives. While knowing your hardiness zone is important, it’s equally essential to consider sun exposure, soil, moisture, and summer heat.

By combining these plant recommendations with proper site preparation, mulching, and watering, your garden can flourish in any U.S. climate.