Heirloom

Belladonna Mix

Delphinium x belladonna

Photo: JLPC · Wikimedia Commons · (CC BY-SA 3.0)

First-year flowering perennial. Well-branched plants produce spikes in dark blue, turquoise, or white. Tall plants may benefit from support - stems can lodge or topple in heavy rain or wind. Attracts bees and butterflies. Often grown as an annual. Perennial in Zones 3-7.

Harvest

130-135d

Days to harvest

📅

Sun

Full sun to partial shade

☀️

Zones

3–9

USDA hardiness

🗺️

Height

1-3 feet

📏

Planting Timeline

Zone:

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Start Indoors

Transplant

Direct Sow

Start Indoors

Transplant

Direct Sow

Showing dates for Belladonna Mix in USDA Zone 7

All Zone 7 flower →

Zone Map

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Belladonna Mix · Zones 3–9

What grows well in Zone 7? →

Growing Details

Difficulty

Easy

Spacing12-18 inches

SoilWell-drained soil, adaptable to average conditions

WaterRegular

SeasonPerennial

ColorDark blue, turquoise, or white

Zone-by-Zone Planting Calendar

Zone	Indoor Start	Transplant	Direct Sow	Harvest
Zone 3	April – May	June – July	June – August	—
Zone 4	March – April	June – June	June – July	—
Zone 5	March – April	May – June	May – July	—
Zone 6	March – April	May – June	May – July	—
Zone 7	February – March	April – May	April – June	—
Zone 8	February – March	April – May	April – June	—
Zone 9	January – February	March – April	March – May	—
Zone 10	January – January	February – March	February – April	—
Zone 1	May – June	July – August	July – September	—
Zone 2	April – May	June – July	June – August	—
Zone 11	January – January	January – February	January – March	—
Zone 12	January – January	January – February	January – March	—
Zone 13	January – January	January – February	January – March	—

Complete Growing Guide

Light: Full sun (6 or more hours of direct sunlight a day), Partial Shade (Direct sunlight only part of the day, 2-6 hours). Soil: High Organic Matter. Soil pH: Alkaline (>8.0). Drainage: Good Drainage. Height: 1 ft. 0 in. - 3 ft. 0 in.. Spread: 1 ft. 0 in. - 2 ft. 0 in.. Spacing: Less than 12 inches. Maintenance: High. Propagation: Seed. Regions: Coastal, Mountains, Piedmont.

Harvesting

Fruit dry, many seeded.

Color: Black, Brown/Copper.

Edibility: Poisonous. Plants are considered toxic to humans if ingested.

Storage & Preservation

Belladonna Mix flowers are ornamental cut flowers best stored in a cool environment. Keep fresh-cut stems in a tall vase filled with clean, cool water at 65-72°F. Change water every 2-3 days and re-cut stems at a 45-degree angle. Vase life typically extends 10-14 days in cool conditions. For preservation, air-dry flower spikes upside-down in a dark, well-ventilated space for 2-3 weeks to create long-lasting dried arrangements. Alternatively, press individual florets between parchment paper under heavy weight for 1-2 weeks for botanical preservation or craft use. Silica gel drying preserves color most effectively when flowers are fully opened.

History & Origin

Origin: Temperate and Subtropical Old World, North America

Advantages

+Attracts: Butterflies, Hummingbirds
+Edible: Poisonous. Plants are considered toxic to humans if ingested.

Considerations

-Toxic (Flowers, Leaves, Seeds, Stems): High severity
-High maintenance

Companion Plants

Marigolds (especially Tagetes patula) and nasturtiums attract parasitic wasps and hoverflies that prey on the aphids delphinium tends to collect on its soft new growth — sweet alyssum and calendula do the same work by different means, drawing in hoverfly adults whose larvae do the actual feeding on aphid colonies. Catmint and lavender are good neighbors for a structural reason: both share delphinium's drainage requirements, so they won't pull the bed toward the soggy conditions that invite Phytophthora root rot. Fennel and black walnut are a different story — fennel releases allelopathic root exudates that suppress nearby plants, and black walnut produces juglone, a compound toxic enough to stunt or kill a broad range of garden plants rooted anywhere near it.

Plant Together

Marigolds

Repel aphids, whiteflies, and nematodes while attracting beneficial insects

Nasturtiums

Act as trap crops for aphids and cucumber beetles, protecting nearby plants

Sweet Alyssum

Attracts beneficial insects like hoverflies and parasitic wasps for natural pest control

Calendula

Repels aphids and tomato hornworms while attracting pollinators

Zinnias

Attract butterflies and beneficial insects, provide good companion height variation

Cosmos

Attract beneficial insects and provide structural support without competing for nutrients

Catmint

Repels ants, aphids, and rodents while attracting pollinators

Lavender

Repels moths, fleas, and mosquitoes with aromatic compounds

Keep Apart

Black Walnut

Produces juglone toxin that inhibits growth and can kill sensitive flowering plants

Eucalyptus

Releases allelopathic compounds that suppress growth of nearby plants

Fennel

Inhibits growth of most garden plants through allelopathic root secretions

Pests & Disease Resistance

Common Pests

Aphids, spider mites, slugs

Diseases

Powdery mildew, root rot in poorly drained soil

Troubleshooting Belladonna Mix

What you'll see, why it happens, and what to do about it.

White powdery coating on leaves and stems, usually appearing mid-summer when nights cool down

Likely Causes

Powdery mildew (Erysiphe aquilegiae or related Erysiphe spp.) — thrives in warm days with cool, humid nights
Poor airflow from crowded planting at less than 12-inch spacing

What to Do

1.Cut affected stems back hard — delphinium will often resprout cleaner foliage
2.Space plants at least 12-18 inches apart and remove any foliage touching the ground
3.Apply a diluted neem oil spray (2 tbsp per gallon) every 7-10 days at first sign; don't wait until the whole plant is coated

Plant suddenly wilts and collapses at the base, stem feels soft or hollow at soil level

Likely Causes

Crown rot or root rot — usually Botrytis cinerea or Phytophthora spp. in waterlogged or poorly drained soil
Planting too deep, which keeps the crown wet

What to Do

1.Dig the plant — if the roots are black and mushy below 2 inches, it's gone; pull it and don't replant delphinium in that spot for 2-3 seasons
2.Amend the bed with coarse grit or perlite before replanting to improve drainage
3.Set the crown slightly above soil grade at transplant time, not buried

Irregular holes chewed in leaves and young shoots, worst damage at soil level in spring

Likely Causes

Slugs (Deroceras reticulatum and related species) — most active after rain or irrigation, especially in cool weather below 65°F
Young transplants and first-year crowns are the most vulnerable

What to Do

1.Set out iron phosphate bait (Sluggo or similar) around the base of plants after any rain or watering; reapply every 5-7 days
2.Lay a ring of coarse diatomaceous earth 3-4 inches wide around each plant — refresh it after rain
3.Check under mulch near the crowns at night with a flashlight and hand-pick

Leaves stippled with tiny pale dots, fine webbing visible on undersides in hot, dry weather

Likely Causes

Two-spotted spider mite (Tetranychus urticae) — populations explode when temperatures exceed 85°F and humidity drops
Drought-stressed plants are hit first and hardest

What to Do

1.Blast the undersides of leaves with a strong stream of water every 2-3 days — it physically dislodges mites and they rarely climb back
2.Apply insecticidal soap (1% solution) directly to leaf undersides; repeat every 5-7 days for at least 3 applications
3.Water consistently at the root zone — a plant under drought stress will lose this fight faster than a well-watered one

Frequently Asked Questions

How long do Belladonna Mix flowers last in a vase?▼

Belladonna Mix cut flowers typically last 10-14 days when kept in cool water (65-72°F) with daily water changes and stem re-cutting. Longevity depends on room temperature and humidity—cooler environments extend vase life significantly. Remove lower foliage to prevent bacterial growth and keep flowers away from ripening fruit and direct heat sources.

Is Belladonna Mix a good flower for beginners?▼

Yes, Belladonna Mix is excellent for beginner gardeners. It's an easy-to-grow, well-branched variety that flowers reliably in its first year. It thrives in full sun to partial shade and requires minimal care. Plants may need staking in windy conditions, but otherwise require standard watering and deadheading to encourage continuous blooms throughout the season.

Can you grow Belladonna Mix in containers?▼

Yes, Belladonna Mix can be grown successfully in containers, though tall plants benefit from support or staking to prevent lodging in wind. Use well-draining potting soil and containers at least 12-15 inches deep. Ensure containers have drainage holes and place in full sun to partial shade. Container plants may dry out faster, so monitor watering carefully during hot weather.

When should I plant Belladonna Mix seeds?▼

Start seeds indoors 6-8 weeks before your last frost date for earlier blooms, or direct sow after all frost danger has passed. Seeds need light to germinate, so scatter them on soil surface and press lightly without covering. Germination occurs in 7-14 days at 70°F. As a tender perennial, it's often grown as an annual in cooler zones (3-7) and may survive winter in warmer climates.

What colors does Belladonna Mix produce?▼

Belladonna Mix produces beautiful spikes in three distinct colors: dark blue, turquoise, and white. The mix creates a striking display when multiple plants bloom together, offering versatility in garden design. Flowers attract bees and butterflies, making them excellent for pollinator gardens and cutting arrangements.

Do Belladonna Mix plants need staking or support?▼

Tall Belladonna Mix plants benefit from staking or support, especially in areas with heavy rain or strong winds. Stems can lodge (bend over) or topple without support. Install stakes or use grow-through supports early in the season when plants are young. This prevents damage to developing flower spikes and maintains an upright, attractive plant form.