Heirloom

Valkyrie Mix

Callistephus chinensis

Harvest

110-120d

Days to harvest

📅

Sun

Full sun to partial shade

☀️

Zones

2–11

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 Valkyrie Mix in USDA Zone 7

All Zone 7 flower →

Zone Map

Click a state to update dates

Valkyrie Mix · Zones 2–11

What grows well in Zone 7? →

Growing Details

Difficulty

Easy

Spacing18-24 inches

SoilWell-drained soil

WaterRegular

SeasonWarm season annual

ColorWhite, light yellow, pink, crimson, rose, dark and light purple

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	—

Succession Planting

Valkyrie Mix runs 110-120 days to bloom, which doesn't leave a lot of room for multiple rounds — but two or three staggered sowings can extend your cutting window meaningfully. Start the first batch indoors in late February to early March, transplant in April, and you'll see blooms by late July. A second indoor sow in late March, transplanted in May, pushes flowers into August and September when the heat starts to back off.

Don't push past a June direct sow in most zones — germination stalls above 75°F soil temperature, and plants started too late won't clear 110 days before frost. In zone 7, anything direct-sown after mid-June is a gamble. Two successions, about 3-4 weeks apart, is usually enough to keep a steady vase supply from midsummer through first frost.

Complete Growing Guide

Needle- or quilled-type blooms atop long sturdy stems. Large, brightly colored, 3½ - 5½" flowers bloom in white, light yellow, pink, crimson, rose, and dark and light purple. Easy to harvest due to the well-branched plant's open airy habit. Long vase life. Also known as summer aster. According to Johnny's Selected Seeds, Valkyrie Mix is 110 - 120 days to maturity, annual, open pollinated. Notable features: Use for Cut Flowers and Bouquets.

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: Clay, High Organic Matter, Loam (Silt), Sand. Soil pH: Acid (<6.0), Neutral (6.0-8.0). Drainage: Good Drainage, Moist. Height: 1 ft. 0 in. - 3 ft. 0 in.. Spread: 1 ft. 0 in. - 1 ft. 6 in.. Spacing: Less than 12 inches. Growth rate: Rapid. Maintenance: Medium. Regions: Coastal, Mountains, Piedmont.

Harvesting

Valkyrie Mix reaches harvest at 110 - 120 days from sowing per Johnny's Selected Seeds. As an annual, harvest continues until frost ends the season.

The fruit is a rough-textured, glandular, purple-mottled cypsela that turns gray with age.

Storage & Preservation

For fresh Valkyrie Mix asters, condition cut stems immediately in cool water for 2-4 hours before arranging. Store in a cool location (65-72°F) with moderate humidity, away from direct sunlight and ripening fruit. Refrigeration extends vase life to 10-14 days; keep stems submerged in fresh water and remove lower foliage. Preservation methods include air drying by hanging bundles upside down in a warm, dark, well-ventilated space for 2-3 weeks, pressing flowers between paper for herbarium use, or freeze-drying for floral arrangements and craft projects.

History & Origin

Valkyrie Mix is open-pollinated, meaning seed saved from healthy plants will produce true-to-type offspring. Listed in the Johnny's Selected Seeds catalog.

Origin: China and Southern Russia

Advantages

+Stunning needle-petaled blooms in six vibrant color options attract pollinators
+Open branching habit produces multiple stems ideal for commercial cut flower harvesting
+Exceptional vase life of 2-3 weeks makes arrangements last longer than competitors
+Long sturdy stems eliminate need for support stakes or expensive infrastructure

Considerations

-110-120 day maturity requires early spring planting for summer harvest windows
-Susceptible to powdery mildew and Fusarium wilt in humid growing conditions
-Requires well-drained soil; performs poorly in heavy clay or waterlogged areas

Companion Plants

Marigolds (especially Tagetes patula), alyssum, and calendula do the most useful work near Valkyrie Mix. Marigolds deter aphids and thrips through scent, and their shallow roots don't compete with asters for moisture. Alyssum draws parasitic wasps and hoverflies — both prey on the aphids that target soft aster foliage — and it fills gaps between 18-24 inch spacings without stealing water. Calendula acts as a trap crop, pulling aphids away from your aster stems before they become a real problem. Skip lavender unless your bed drains exceptionally fast; it wants drier conditions than China asters do, and one of them will always look unhappy.

Sunflowers are the planting neighbor to avoid. They release allelopathic compounds from their roots and decomposing seed hulls that suppress germination and slow establishment — China asters show this sensitivity more than a lot of annuals do. Black walnut operates the same way via juglone, a toxin that can linger in soil for years after the tree is removed. Neither belongs anywhere near a cutting bed of Valkyrie.

Plant Together

Marigolds

Repel aphids, whiteflies, and nematodes while attracting beneficial insects

Alyssum

Attracts beneficial insects like lacewings and provides ground cover

Nasturtiums

Act as trap crops for aphids and cucumber beetles

Lavender

Repels moths, fleas, and flies while attracting pollinators

Calendula

Attracts beneficial insects and helps deter aphids and whiteflies

Zinnia

Attracts butterflies, bees, and beneficial predatory insects

Cosmos

Attracts beneficial insects and provides complementary flower colors

Catmint

Repels ants, aphids, and rodents while attracting pollinators

Keep Apart

Black Walnut

Produces juglone toxin that inhibits growth of many flowering plants

Eucalyptus

Releases allelopathic compounds that suppress nearby plant growth

Sunflowers

Can inhibit growth of smaller flowers through allelopathy and competition for resources

Troubleshooting Valkyrie Mix

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

Seedlings collapse at soil level, stems pinched-looking and dark, 7-14 days after germination

Likely Causes

Damping off — typically Pythium or Rhizoctonia solani, both thrive in cold, wet, poorly-ventilated flats
Overwatering combined with low airflow around the seedling tray

What to Do

1.Water from below (set tray in a shallow dish) so the soil surface stays drier
2.Run a small fan on low near your seed trays for 30-60 minutes a day to move air
3.Discard affected cells entirely — the fungus spreads fast through shared media

White powdery coating on leaves and stems, usually showing up mid-summer as nights cool down

Likely Causes

Powdery mildew (Erysiphe cichoracearum) — common on China asters, especially in humid conditions with poor spacing
Plants crowded closer than 18 inches, limiting airflow between stems

What to Do

1.Space transplants a full 18-24 inches apart — that gap matters more than it looks like it will in April
2.At first sign, spray with a diluted potassium bicarbonate solution or a baking soda mix (1 tsp baking soda per quart of water with a drop of dish soap)
3.Pull and trash any heavily infected plants at season's end — don't compost them

Stunted plants with yellowed, mottled leaves; flowers distorted or failing to open fully

Likely Causes

Aster yellows — a phytoplasma disease spread by the aster leafhopper (Macrosteles quadrilineatus)
No cure once infected; leafhoppers can transmit it from weeds in under 15 minutes of feeding

What to Do

1.Pull and bag infected plants immediately — they're a reservoir for leafhoppers to feed on and move to healthy plants
2.Manage weeds around your planting area, especially broadleaf ones like dandelion and plantain that leafhoppers overwinter in
3.Use row cover over young transplants for the first 3-4 weeks to reduce leafhopper pressure during establishment

Frequently Asked Questions

How long do Valkyrie Mix aster flowers last in a vase?▼

Valkyrie Mix asters have an excellent long vase life, typically lasting 10-14 days when properly conditioned and cared for. Place stems in cool water immediately after cutting, remove lower foliage, and keep them in a cool location away from direct sunlight and ripening fruit. Refresh the water every 2-3 days and re-cut stems slightly for maximum longevity.

Are Valkyrie Mix asters good for beginner gardeners?▼

Yes, Valkyrie Mix is excellent for beginners. This heirloom variety is rated as easy to grow, produces abundant blooms on well-branched plants with an open, airy habit that requires minimal maintenance. They're also easy to harvest and arrange, making them perfect for gardeners new to flower growing.

Can you grow Valkyrie Mix asters in containers?▼

Yes, Valkyrie Mix asters can be grown in containers. Plant them in well-draining soil in pots at least 12-14 inches deep, ensuring they receive full sun to partial shade (4-6+ hours daily). Water regularly and deadhead spent blooms to encourage continuous flowering throughout the season.

When should I plant Valkyrie Mix aster seeds?▼

Start Valkyrie Mix seeds indoors 6-8 weeks before your last spring frost date, or direct sow seeds outdoors after the last frost danger has passed. These summer asters take 110-120 days to harvest, so timing your planting accordingly ensures peak blooms during summer and fall months.

What colors do Valkyrie Mix asters come in?▼

Valkyrie Mix asters bloom in a vibrant range of colors including white, light yellow, pink, crimson, rose, and both dark and light purple. The needle- or quilled-type petals create large 3½-5½ inch flowers that make striking cut arrangements when mixed together.

Do Valkyrie Mix asters need full sun to bloom well?▼

Valkyrie Mix asters perform best in full sun but tolerate partial shade, requiring 4-6 or more hours of direct sunlight daily. While they can bloom in less light, full sun exposure maximizes flower production and plant vigor. Ensure good air circulation to maintain the open, airy habit.