Dwarf Sunflower
Sonja is a compact, branching sunflower bred for the cut flower trade, a workhorse variety that delivers armfuls of blooms from midsummer straight through fall. Reaching 36 to 48 inches tall with a naturally bushy habit, this open-pollinated cultivar produces outstanding flowers on sturdy stems in just 70 to 84 days from seed to bloom. Its combination of reliable performance, drought tolerance, and pollinator appeal makes it as valuable in a cutting garden as it is in a sunny border.
Full Sun
Moderate
2-11
48in H x 24in W
Perennial
High
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What sets Sonja apart is its reputation as an outstanding cut flower backed by genuine performance in the garden. The bushy growth habit means you're not waiting for a single stem to mature, instead, the plant branches naturally to produce multiple blooms per season. Direct seeding works beautifully, flowers emerge reliably within 70 to 84 days, and the extended bloom window from June through November means you can harvest continuously. Pair that with genuine drought tolerance once established, and you have a sunflower that thrives with minimal fussing while delivering exactly what florists and arrangers want.
Sonja earns its reputation as an outstanding cut flower. The stems are sturdy enough for arranging, and the extended bloom season means you can harvest flowers for arrangements from early summer well into fall. Flowers can be cut at different stages depending on your preference, harvest them tight when color first shows for arrangements that will open gradually in the vase, or wait until blooms are nearly fully open for instant impact. For dried arrangements, allow flowers to fully open on the plant before cutting and hanging or preserving with silica gel.
Sonja can be started indoors in 72 to 50-cell flats sown 2 to 3 weeks before your planting-out date, though direct seeding is preferred. Sow seeds ½ inch deep in flats indoors. Keep in mind that sunflowers dislike root disturbance, so be gentle when transplanting and try to minimize damage to the root system during the shift outdoors.
Transplant seedlings outside after your last frost date when soil has warmed. Harden off plants gradually to prepare them for outdoor conditions. Spacing varies depending on your goal—closer spacing (around 2 inches) will produce more plants with fewer branches each, while wider spacing (up to 18 inches) encourages more branching per plant and longer individual stems.
Direct sowing is the recommended method. After your last frost date, sow seeds ¼ inch deep directly into prepared garden soil. Seedlings will emerge in 5 to 14 days. For continuous harvest, succession-sow every 2 to 3 weeks throughout the growing season, or plant multiple varieties at once to stagger blooms naturally.
Harvest flowers when they've reached your preferred stage of openness. For longer vase life in fresh arrangements, cut flowers tight, as soon as color first shows on the bloom, and they'll open gracefully over several days indoors. For immediate impact or dried use, wait until flowers are almost completely open or fully open before cutting. Cut stems in the early morning when they're most turgid, removing crop residues afterward to keep the garden clean.
Pinching branching varieties like Sonja is recommended to encourage more branches and longer stems suitable for cutting. By removing the central growing tip when plants are young, you redirect energy into side shoots, multiplying your flower production per plant.
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