Cool-season versus warm-season cut flower lists for the Pacific Northwest

What to take away

Two growing regions, two calendars

The Cascade Range decides which cut flowers you can grow in Oregon and Washington. West of it, winters are mild and wet and summers are dry. East of it, summers are hot, winters are cold, and rainfall is low.

The USDA Plant Hardiness Zone Map puts most of the Willamette Valley in zones 8a to 9a. That is what lets growers there overwinter ranunculus, anemone and bulbs in the ground. Puget Sound sits in similar zones but runs cooler and cloudier, with fewer days above 85 F. Warm-season crops start slower there and hold longer in the vase.

Bend, Yakima and the Columbia Basin are a different farm. Frost dates are later in spring and earlier in fall, and the ground freezes hard. Warm-season crops yield well under irrigation, but the window is shorter and less forgiving.

USDA NASS publishes the state-level baseline for floriculture production through the Census of Horticultural Specialties. Acreage and price series come from NASS state statistics and the queryable Quick Stats database. Quick Stats Lite is faster when you only need a few crops. Check your price assumptions against those series before you commit a bed.

Cool-season crops that carry spring

Cool-season cut flowers germinate and bloom in cool weather. In this region they run from late winter into early summer, and they are why a Pacific Northwest farm can sell local stems in April while growers in most states are still waiting on the ground to thaw.

Bulbs and poppies finish the list. Ornamental alliums go in as fall bulbs and bloom May to June, with heads that carry a premium.

Tulips and daffodils are fall-planted and bloom March to May, and they are the backbone of early spring sales in both states.

Iceland poppies go in during fall or early spring and bloom May to June; they are delicate and sell best locally and fast.

Cool-season crops reward early planting and steady moisture. West of the Cascades you can succession sow sweet peas and larkspur from February through April. East of them, wait until the soil can be worked, usually March or April.

When you weigh which crop deserves the bed, compare stem price against days to harvest. Ranunculus and tulips win on price per stem; bupleurum and bells of Ireland win on volume and ease.

Our guide to cut flower growing mistakes works that comparison crop by crop.

Warm-season crops and their windows

Warm-season cut flowers need soil above 60 F and no frost. In the Pacific Northwest that means June through September or October, depending on the crop and which side of the mountains you farm.

Statice, strawflower and marigolds fill out the rest. Statice and strawflower transplant after frost, bloom July to September, and dry well. Marigolds are cheap to grow and steady sellers at a farm stand.

If you are choosing between two summer earners, our cut flower farm case study breaks down revenue per bed and labor per stem.

What a bed actually returns

Rent, irrigation and labor are roughly fixed per bed, so the crop that returns the most per bed per season is the one that pays. Work the arithmetic with your own figures: stems per bed times farm-gate price per stem, minus seed or corm cost and harvest hours.

Cool-season crops usually produce fewer stems per bed and sell at higher prices early in the year. Tulips, ranunculus and anemone bring premiums in April when local supply is thin. Sweet peas and stock sell well at market but their short vase life limits wholesale.

Warm-season crops produce more stems over a longer window, but prices fall in midsummer when everyone has zinnias. Dahlias and specialty celosia hold price better than sunflowers, which are cheap and heavy to ship.

A worked comparison for one 100-foot bed in the Willamette Valley, using illustrative farm-gate prices:

The warm-season bed wins on gross revenue. The cool-season bed spreads cash across spring and lowers the risk that one heat event takes the whole crop.

Many farms run both and use spring income to fund summer labor. Succession sowing stretches the warm-season bed and avoids a glut.

Our succession planting and season extension guide covers the intervals that work here.

Overwintering west of the Cascades

Western Oregon and western Washington are among the few places in the country where cut flower crops overwinter in the ground. That is the region's clearest competitive advantage.

Fall planting is the mechanism. Ranunculus corms, anemone corms, tulip bulbs and daffodil bulbs go in from October to November in zones 8 and above. They root before winter, then push growth in February and March. Fall-sown sweet peas usually beat spring-sown ones by three to four weeks, which matters when you are chasing April markets.

Low tunnels and row cover keep foliage clean and speed early growth. They also buffer the occasional hard freeze, which still happens in the Willamette Valley and Puget Sound.

East of the Cascades, overwintering is a gamble. Bulbs can survive under mulch, and they may need irrigation before the ground freezes. Corms and tender perennials usually will not, so price them as annuals. Understanding cut flower crop types tells you which ones to overwinter and which to replant.

Early spring harvest runs in sequence: daffodils and tulips in March, ranunculus and anemone in April, sweet peas and stock in May.

Market windows from April through October

Pacific Northwest market windows are set by local supply, not by the calendar. When local stems are scarce, prices hold. When everyone has zinnias, they do not.

Wholesale buyers in Portland and Seattle book spring and fall weddings months ahead. Retail florists buy weekly. Farm stands and farmers markets sell the widest range but need steady volume. If you want to test whether a shorter list can still cover a year, our cut flower garden checklist shows which four crops carried a full season.

Matching the list to Portland and Seattle buyers

Portland and Seattle are not the same market. Portland has a deep farmers market culture and a large wedding trade. Seattle has more corporate events and a wholesale market that moves volume.

Portland buyers favor local, seasonal and unusual stems. Sweet peas, ranunculus and dahlias sell. Market booths reward color and fragrance.

Seattle florists and event designers want consistency and vase life. Zinnias, dahlias, gladiolus and statice fit that demand, and wholesale accounts want stems graded and bunched to a standard.

Both cities pay a premium for local stems in the shoulder months. April tulips and ranunculus from western Oregon and Washington beat imported stems on freshness and on story.

Match the list to the buyer. Selling mostly at farmers markets means a wide cool-season list plus zinnias and dahlias. Selling wholesale means narrowing to crops that grade and ship well. NASS production and price series are where you check those assumptions before planting.

Common questions

What separates cool-season from warm-season cut flowers?

Cool-season cut flowers germinate and bloom in cool weather, usually spring into early summer. Warm-season cut flowers need warm soil and no frost, so they bloom from summer into fall. The split is about soil temperature and frost dates, not about the calendar month.

Can I grow dahlias in western Washington?

Yes, but they start and bloom later than in western Oregon. Plant tubers after the last frost and expect peak bloom in August and September. Cooler summers slow them down and also extend vase life after cutting.

When should I plant ranunculus in Oregon?

Plant corms in October or November in western Oregon for April and May bloom. In eastern Oregon, plant in early spring instead, because winter cold kills the corms. Drainage matters more than timing; corms rot in saturated ground.

Do I need irrigation east of the Cascades?

Yes. Eastern Oregon and eastern Washington are dry, so warm-season crops need consistent irrigation and cool-season crops benefit from spring water. Confirm water rights and delivery timing with your state water resources office before you plant a new block.