Clarkia – Winecup

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Winecup Clarkia (Clarkia purpurea) is a native, cool-season annual wildflower known for its colorful pink, purple, lavender, and wine-red flowers. The four-petaled flowers have a distinctive cup-like shape and can add a bright display to native meadows, prairies, open woodlands, and naturalized gardens.

Winecup Clarkia generally grows about 6–30 inches tall, depending on growing conditions. Plants produce slender, upright stems with narrow green leaves and multiple flowers along the upper portions of the stems.

Winecup Clarkia grows best in full sun to light shade and prefers well-drained soil. It is adaptable to a range of soil types and can tolerate relatively dry conditions once established. It is naturally found in open grasslands, dry slopes, meadows, woodland openings, and areas with relatively low competition from dense vegetation.

Winecup Clarkia is well suited to native wildflower gardens, meadows, prairie plantings, pollinator gardens, restoration projects, woodland edges, and naturalized landscapes.

The flowers attract native bees, honey bees, butterflies, flies, and other pollinating insects. Its spring and early-summer bloom period makes it a useful addition to diverse native wildflower plantings.

Winecup Clarkia is an annual and completes its life cycle within one growing season. After flowering and producing seed, the plants die back. Under favorable conditions, seed can fall naturally and produce new plants in subsequent years.

Native Range

British Columbia, Washington, Oregon, California, Arizona, and northwestern Mexico.

Pacific Northwest Planting

For gardeners and restoration projects in the Pacific Northwest, Winecup Clarkia can be planted in either fall or early spring.

Fall planting is generally the preferred method. Sow seed directly into a prepared, weed-free planting area after temperatures have cooled and fall moisture is available.

Winecup Clarkia seed can be surface sown or covered very lightly with soil. Good seed-to-soil contact is important, but the seed should not be buried deeply.

Early spring planting can also be successful, particularly where adequate spring moisture is available. Plant as early as practical while temperatures remain cool.

Fall Planting

Fall is an excellent planting season for Winecup Clarkia in the Pacific Northwest.

Sow after the heat of summer has passed and temperatures have cooled. Broadcast the seed over a prepared, weed-free planting area and press it firmly into the soil surface.

No special seed treatment is generally required. Fall sowing allows the seed to experience natural cool and moist conditions and can result in germination during the cool season or early spring.

Choose a site with good drainage and adequate winter and spring moisture. Avoid areas where water remains standing for extended periods.

Fall planting can also allow Winecup Clarkia to establish early enough to take advantage of spring moisture before the onset of summer dryness.

Spring Planting

Winecup Clarkia can also be planted in early spring.

Prepare a firm, weed-free seed bed and broadcast the seed directly onto the soil surface. Press the seed into good contact with the soil rather than covering it deeply.

Keep the planting area adequately moist during germination and early growth.

Because Winecup Clarkia is a cool-season annual, early spring planting is preferable to planting after temperatures have become consistently warm.

Planting in Other Regions

Winecup Clarkia is well suited to much of the western United States and areas with cool to moderate spring growing conditions.

In regions with mild winters, fall planting is generally preferred. In colder climates, early spring planting can be used once soil conditions are suitable.

Winecup Clarkia performs best in full sun to light shade and well-drained soils. It is adaptable to a variety of soil types and can tolerate relatively dry conditions once established.

In warmer or drier regions, choose a site where plants can complete their growth and flowering before intense summer heat and drought become severe.

Establishment & Growth

Winecup Clarkia is an annual wildflower that grows, flowers, produces seed, and completes its life cycle within a single growing season.

Good seed-to-soil contact is important because the seed should be planted shallowly. Prepare a firm, weed-free planting area and avoid burying the seed deeply.

Keep competing weeds and aggressive grasses under control during establishment. Winecup Clarkia performs best where young plants have adequate access to light and are not overwhelmed by taller vegetation.

Under favorable conditions, plants can establish relatively quickly and generally bloom during spring and early summer.

Once established, Winecup Clarkia can reseed naturally. Allowing some plants to produce and drop seed can help maintain the species in a naturalized planting from year to year.

Choosing the Right Site

Choose a location with full sun to light shade and well-drained soil.

Winecup Clarkia is particularly well suited to open meadows, grasslands, prairie plantings, woodland openings, dry slopes, and areas with relatively low competition from established vegetation.

It can tolerate a range of soil conditions but performs best where excess water drains readily.

Avoid heavily shaded locations and areas with dense, aggressive perennial vegetation that can outcompete young annual plants.

Larger Quantities

For quantities larger than those currently listed for sale, please contact us for availability and pricing.

Seeding Rates

The broadcast rate for seeding is 4–5 pounds per acre.

The seed drill rate for seeding in rows is 2 pounds per acre.