Hardiness zone guide

Plants for Zone 9

Winter lows of 20°F to 30°F set the rules here — nearly year-round growing — heat tolerance matters more than cold. Every plant below is proven hardy in Zone 9 and ranked by how many Sow gardeners actually grow it.

7,422 hardy plantsWinters: 20°F to 30°FLast frost ≈ late February

Most-saved Zone 9 plants

#1 most saved

Butterfly Weed

Asclepias tuberosa

Zones 4–9· 604 saves· from $10

#2 most saved

Cheyenne Spirit Coneflower

Echinacea purpurea 'Cheyenne Spirit'

Zones 4–9· 574 saves· from $13

#3 most saved

Pink Muhly Grass

Muhlenbergia capillaris

Zones 5–10· 403 saves· from $16

Butterfly Weed

Asclepias tuberosa 'Gay Butterflies Mix'

Zones 4–9· 382 saves

Butterfly Weed Gay Butterflies Milkweed

Asclepias tuberosa 'Gay Butterflies'

Zones 4–9· 376 saves· from $50

Hello Yellow Butterfly Weed

Asclepias tuberosa 'Hello Yellow'

Zones 4–9· 369 saves· from $16

Butterfly Milkweed

Asclepias x hybrida

Zones 4–9· 366 saves· from $16

Old Farmyard Hollyhock

Alcea rosea 'Old Farmyard'

Zones 4–9· 360 saves

May Night Sage

Salvia nemorosa 'May Night'

Zones 4–9· 358 saves· from $6

Black-eyed Susan

Rudbeckia hirta 'American Gold Rush'

Zones 4–10· 353 saves· from $17

Pugster Amethyst Butterfly Bush

Buddleja davidii 'Pugster Amethyst'

Zones 5–9· 351 saves· from $19

Pugster Pink Butterfly Bush

Buddleia davidii 'Pugster Pinker'

Zones 5–9· 342 saves· from $19

Blanket Flower

Gaillardia x grandiflora 'Mixed Border'

Zones 4–10· 340 saves

Incrediball Hydrangea

Hydrangea arborescens 'Incrediball'

Zones 4–9· 339 saves· from $21

Zinnia Raggedy Ann

Zinnia elegans 'Raggedy Ann'

Zones 5–10· 338 saves

Cinderella Milkweed

Asclepias incarnata 'Cinderella'

Zones 4–9· 336 saves· from $22

Prairie Phlox

Phlox pilosa

Zones 4–9· 335 saves

Cheyenne Spirit Coneflower

Echinacea purpurea 'Cheyenne Spirit Mix'

Zones 4–9· 332 saves

Common Milkweed

Asclepias syriaca

Zones 4–9· 329 saves· from $10

Wild Lupine

Lupinus perennis

Zones 4–9· 324 saves

Purple Coneflower

Echinacea purpurea

Zones 4–9· 321 saves· from $8

Black-eyed Susan

Rudbeckia fulgida 'Goldsturm'

Zones 4–9· 318 saves· from $7

Trio Butterfly Bush

Buddleja davidii 'Trio'

Zones 5–9· 317 saves

Dahlia

Dahlia variabilis

Zones 5–10· 315 saves

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Zone 9 questions

What does USDA Zone 9 mean?

Zone 9 averages winter minimums of 20°F to 30°F. A plant rated for Zone 9 survives those lows in the ground — nearly year-round growing — heat tolerance matters more than cold.

When is the last frost in Zone 9?

Frost is late February in Zone 9 — most years pass without a killing freeze, so planting is nearly year-round.

How many plants grow in Zone 9?

7,422 plants in the Sow catalog are hardy in Zone 9, from groundcovers to shade trees. The picks above are ranked by real gardener saves, not editorial guesswork.

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Garden smarter in Zone 9

Sow knows your zone, tracks your real weather, and tells you what to plant, prune, and protect — week by week.