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2024 Seed Catalog

Double Extreme dahlia seeds
Best Seller

AN15055

Double Ex­treme

Dahlia Seeds

Dwarf 18-24 in. tall plants are covered in shapely double and semi double, 4-4½ in. wide flowers. The blooms are richly colored, and include unique sunset shades.

Plants flower all summer, and are beautiful additions to beds, borders, or containers.

30 seeds - $3.49
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View all of our Dahlia varieties.

Growing Double Ex­treme Dahlia Seeds

Bee introduces how to plant

Plant Dahlia Seeds: Sow seed in cell packs or 2 in. pots, press into soil and barely cover. Kept at 75°F., germination is in 7-20 days. Transplant into the garden 12 in. apart for dwarf dahlias, and 24 to 36 in. apart for tall dahlias.

Grow Dahlia: Full sun, prefers afternoon shade in hot, dry climates. Keep soil moist, water deeply 2-3 times per week. Flowers attract butterflies, and are excellent for cutting. Plants are deer resistant, may be damaged when access to regular food or water is limited. Tubers are dug in autumn, stored for the winter, planted the following spring.

Shipping Information

U.S. Shipping Rates

Free shipping on U.S. orders over $60.00.
Free priority shipping on U.S. orders over $150.00.

Standard U.S. shipping is $5.99.
Priority U.S. shipping is $9.99.


International Shipping Rates

Shipping to Canada is $13.99.
International shipping to all other countries is $15.99.

Satisfaction Guarantee

We guarantee all the seeds we sell for one full year from the date of purchase. If you are unsatisfied with any seeds purchased from Swallowtail Garden Seeds, we will issue a refund. For customers in the U.S., we can send one-time replacements or issue a refund.