Zinnia Dahlia Flowered Mix with large double blooms in a bright color mix

How to Grow Zinnia Dahlia Flowered Mix From Seed

By Maxim Kaufman — Founder & CEO, Organo Republic

Updated July 2026

If you love the look of dahlias but want them from a packet of easy seed, this is your flower. The Dahlia Flowered zinnia mix produces big, fully double blooms in a bright rainbow of colors on tall, sturdy plants around 3 feet high. They are heat-loving, low-fuss, and among the best cut flowers you can grow, blooming more the more you cut and buzzing with butterflies and bees all summer. Sow them once the weather warms and you will have bold color from midsummer right up to frost.

This is the quick guide to the Dahlia Flowered zinnia mix. For the full step-by-step on starting seeds, sowing, feeding, and troubleshooting zinnias, see our complete guide to growing zinnias from seed.

Quick start

Direct sow the Dahlia Flowered Mix after your last frost once the soil is warm, since zinnias love heat and dislike cold, wet ground. Plant seeds about a quarter inch deep in full sun, keep them moist until they sprout in about a week, and thin to 8 to 12 inches apart for good airflow. Pinch the plants when young to encourage branching, and expect big double blooms in roughly 60 to 70 days. Deadhead or cut for the vase often, and the plants will bloom right up to frost.

Best tip

Cut early and often, and keep the leaves dry. Zinnias are a cut-and-come-again flower, so the more you harvest the more they bloom. Snip stems for the vase or deadhead spent flowers regularly to keep the plants pumping out color. Water at the base rather than overhead and give plants room to breathe, since good airflow is the best defense against the powdery mildew zinnias are prone to in humid, crowded conditions.

At a glance

Botanical nameZinnia elegans (dahlia-flowered type)
Plant typeAnnual flower
USDA zones2 to 11 (grown as an annual)
SunFull sun
Days to maturityAbout 60 to 70 days to bloom
Height2.5 to 3 ft
Spacing8 to 12 in apart
WaterModerate; water at the base

The best companion plants

Cosmos Seeds
Cosmos SeedsCut-flower companionAiry cosmos loves the same heat and sun and fills out a cutting garden.$14.99$12.99
View product
Marigold Seeds Pack
Marigold Seeds PackPollinator pairingTough, bright marigolds pair perfectly with zinnias in a summer bed.$12.99$8.99
View product
Sunflower Mix Seeds Pack
Sunflower Mix Seeds PackSunny companionA sunflower mix adds height and pollinator power behind your zinnias.$14.99$12.99
View product

Uses

This dahlia-flowered zinnia mix produces large, fully double blooms in a bright mix of colors on tall, sturdy plants 2.5 to 3 feet high. The big, layered flowers look like dahlias and are outstanding cut flowers, holding beautifully in the vase for a week or more and blooming more the more you cut. In the garden they bring bold, long-lasting color from midsummer to frost and are a magnet for butterflies, bees, and other pollinators. They are ideal for cutting gardens, sunny borders, and anywhere you want dependable, showy color with almost no fuss.

Frequently asked questions

What is a dahlia-flowered zinnia?

A dahlia-flowered zinnia is a type of Zinnia elegans bred for large, fully double blooms that look like dahlias, with many layers of petals and a flat to slightly domed shape. This mix delivers those big double flowers in a bright range of colors on tall, sturdy 2.5 to 3 foot plants.

How tall do dahlia-flowered zinnias grow?

These are tall zinnias, reaching about 2.5 to 3 feet, which makes them excellent for the middle or back of a border and for cutting. Space plants 8 to 12 inches apart for good airflow, and pinch them young to encourage strong, branching stems.

Are dahlia-flowered zinnias good cut flowers?

They are outstanding cut flowers. The big double blooms hold in the vase for a week or more, and because zinnias are cut-and-come-again, the more you harvest the more they bloom. Cut stems in the morning once the flower is fully open for the longest vase life.

How long do dahlia-flowered zinnias take to bloom?

Expect blooms in about 60 to 70 days from sowing. Direct sow after your last frost once the soil is warm, since zinnias love heat, and they will flower from midsummer right up to the first fall frost if you keep cutting and deadheading.

Ready to grow your own dahlia-flowered zinnias? Start with our non-GMO, heirloom zinnia seeds for big, double, butterfly-loved blooms all summer, and browse more easy cut flowers in our wildflower seed collection.

Zinnia Seeds Pack
Zinnia Seeds PackGrow it from seedThousands of heirloom, non-GMO zinnia seeds for big, bold, butterfly-loved blooms.$14.99$12.99
View product

Want a whole cutting garden? Pair these zinnias with our non-GMO wildflower mixes:

21 Annual Wildflower Seeds Mix
21 Annual Wildflower Seeds Mix21 annual varietiesAn easy annual wildflower mix for a fast wave of color.$24.99$22.99
View product
23 Birds & Butterflies Wildflower Seeds Mix
23 Birds & Butterflies Wildflower Seeds Mix23 varietiesA birds and butterflies blend to keep the pollinators coming.$14.99$12.99
View product
19 Bees & Pollinators Wildflower Seeds Mix
19 Bees & Pollinators Wildflower Seeds Mix19 varietiesA bees and pollinators mix that pairs beautifully with zinnias.$24.99$22.99
View product
Maxim Kaufman, Founder and CEO of Organo Republic

By Maxim Kaufman — Founder & CEO, Organo Republic

Maxim founded Organo Republic in 2017 and personally selects, tests, and grows the heirloom, non-GMO varieties the company offers. Under his leadership, Organo Republic was named Agri Business Review’s Top Non-GMO Seed Variety Solution 2026.