Heirloom

Azumi XL Blue

Callistephus chinensis

Photo: Salicyna · Wikimedia Commons · (CC BY-SA 4.0)

The Azumi series offers 2-3 1/2" pom-pom style blooms in rich jewel tones on sturdy, vigorous plants. Recommended for growing as a spray-type cut flower. Plants yield one cut per plant; each cut is a large spray of stems and flowers. The primary flower will be larger, surrounded by multiple slightly smaller blooms. Alternately, single stems can be harvested, although stem length will be shorter than when harvested as a one-cut spray type. Lavender-blue bloom color. Azumi XL Blue flowers are the earliest of the Azumi series in our trials. Fusarium tolerant.

Harvest

105-120d

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 Azumi XL Blue in USDA Zone 7

All Zone 7 flower →

Zone Map

Click a state to update dates

Azumi XL Blue · Zones 2–11

What grows well in Zone 7? →

Growing Details

Difficulty

Easy

SeasonWarm season annual

ColorLavender-blue

Size2-3 1/2"

Zone-by-Zone Planting Calendar

Zone	Indoor Start	Transplant	Direct Sow	Harvest
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	—
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	—

Succession Planting

Azumi XL Blue takes 105–120 days to bloom, so you don't get the continuous cut-and-come-again cycle you'd expect from zinnias — each plant gives you one main flush. Stagger indoor sowings every 3 weeks from early February through mid-March to spread those flush windows across summer and into early fall. Don't start new seeds after late May; plants sown past that point won't accumulate enough days before heat shuts them down or early frost arrives.

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: 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

Azumi XL Blue reaches harvest at 105 - 120 days from sowing per Johnny's Selected Seeds. Expect 2-3 1/2" at peak. 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 cut flowers, immediately place Azumi XL Blue stems in clean, cool water (65-72°F) upon harvest. Store in the refrigerator at 34-40°F with 80-90% humidity to maximize vase life of 7-10 days. Change water every 2-3 days and re-cut stems at an angle. Preservation methods: (1) Dry blooms by hanging upside-down in a dark, well-ventilated space for 2-3 weeks to create long-lasting dried arrangements; (2) Preserve with silica gel in an airtight container for 1-2 weeks to retain color and form; (3) Press individual flowers between parchment paper under weight for 2-3 weeks for floral crafts and scrapbooking.

History & Origin

Azumi XL Blue 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

+Earliest Azumi series variety with reliable 105-120 day maturity
+Large pom-pom blooms in attractive lavender-blue jewel tone
+One plant yields abundant spray of multiple stems and flowers
+Fusarium tolerant, reducing disease pressure in susceptible soils
+Sturdy, vigorous plants need minimal staking or support

Considerations

-Requires full one-cut harvest to maximize spray-type yield potential
-Single stem harvests produce noticeably shorter stem lengths than sprays
-Pom-pom style blooms may shatter easily during rough handling
-Best as spray cut flower, limiting design flexibility versus other forms

Companion Plants

Marigolds — specifically French marigolds (Tagetes patula) — release thiophenes from their roots that suppress soil nematodes, and their scent is thought to confuse aphids before they locate your asters. Sweet alyssum draws in parasitic wasps and hoverflies that knock back thrip and aphid pressure without much effort on your part. Nasturtiums work well as a trap crop for black aphids, pulling them off the asters onto expendable foliage. Skip black walnut anywhere nearby: juglone, the compound it produces, leaches through soil and can stunt or kill annuals planted within the drip line. Sunflowers are a subtler problem — decomposing sunflower roots and tissue release allelopathic compounds that can suppress neighboring plants, so give them their own bed.

Plant Together

Marigolds

Repel aphids, whiteflies, and nematodes while attracting beneficial insects

Sweet Alyssum

Attracts beneficial insects like lacewings and provides ground cover

Nasturtiums

Act as trap crops for aphids and cucumber beetles while deterring pests

Lobelia

Complements blue flowers and attracts pollinators with similar growing requirements

Petunias

Repel aphids, tomato hornworms, and squash bugs while providing color contrast

Zinnia

Attracts butterflies and beneficial insects while providing height variation

Catnip

Repels mosquitoes, ants, and aphids more effectively than DEET

Lavender

Deters moths, fleas, and mice while attracting pollinators

Keep Apart

Black Walnut

Produces juglone toxin that inhibits growth and can kill sensitive plants

Eucalyptus

Allelopathic compounds suppress growth of nearby plants

Sunflowers

Compete aggressively for nutrients and water, may stunt smaller plants

Troubleshooting Azumi XL Blue

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

Seedlings collapse at soil level, stems pinched off or rotted at the base

Likely Causes

Damping off — typically Pythium or Rhizoctonia fungi thriving in wet, poorly drained seed-starting mix
Overwatering combined with low airflow around seedlings

What to Do

1.Toss the affected seedlings; don't try to save them — the fungus spreads fast
2.Water only from the bottom, let the top of the mix dry slightly between waterings
3.Run a small fan near your seedling trays for 30–60 minutes a day to improve airflow

White powdery coating on leaves and stems, usually appearing mid-summer

Likely Causes

Powdery mildew (Erysiphe cichoracearum) — very common on Callistephus chinensis, especially when nights cool below 65°F and days stay warm
Crowded planting that blocks air circulation

What to Do

1.Strip and bag badly affected leaves — don't compost them
2.Spray remaining foliage with a potassium bicarbonate solution or diluted neem oil every 7 days
3.Space plants at least 12 inches apart next season and avoid overhead irrigation

Stunted plants with yellowed, distorted new growth; flower buds fail to develop or abort

Likely Causes

Aster yellows — a phytoplasma disease vectored by the aster leafhopper (Macrosteles quadrilineatus)
Infected plants cannot be cured

What to Do

1.Pull and bag infected plants immediately — leaving them in the bed gives leafhoppers more time to ferry the phytoplasma to healthy plants
2.Cover transplants with floating row cover early in the season before leafhopper populations build
3.Rotate out of this bed entirely the following year; the phytoplasma has a wide host range

Petals and flower heads show gray-brown rot, especially during wet weather close to bloom time

Likely Causes

Botrytis blight (Botrytis cinerea) — opportunistic fungus that moves fast on dense, double-flowered blooms like Azumi XL
High humidity or overhead watering that leaves petals wet overnight

What to Do

1.Cut and discard affected blooms at first sign — don't leave spent or rotting heads on the plant
2.Water at the base of the plant in the morning so foliage dries before nightfall
3.Stake flopping stems so heads aren't pressing against each other and trapping moisture

Frequently Asked Questions

How many days until Azumi XL Blue is ready to harvest?▼

Azumi XL Blue flowers are the earliest-maturing in the Azumi series, requiring 105-120 days from planting to first harvest. This makes them ideal for gardeners seeking quicker blooms compared to other pom-pom varieties. The exact timing depends on growing conditions and your specific climate zone.

Is Azumi XL Blue good for beginner flower growers?▼

Yes, Azumi XL Blue is excellent for beginners. It's rated as 'Easy' difficulty, tolerates Fusarium disease, and grows vigorously on sturdy plants. It thrives in full sun to partial shade (4-6+ hours) and requires no special care beyond basic watering and deadheading to encourage continued blooms throughout the season.

Can you grow Azumi XL Blue in containers?▼

Yes, Azumi XL Blue can be grown in containers as long as they're large enough to support vigorous growth—12-18 inches deep minimum. Container growing works well for cut flower production, though ensure good drainage and consistent moisture. Place in full sun to partial shade for best blooming.

What does Azumi XL Blue look like as a cut flower?▼

Azumi XL Blue produces 2-3.5 inch lavender-blue pom-pom style blooms on sturdy stems. Each plant yields one large spray cut with a prominent primary flower surrounded by multiple smaller blooms, or you can harvest individual stems for shorter arrangements. The blooms are ideal for bouquets and floral design.

When should I plant Azumi XL Blue?▼

Plant Azumi XL Blue after your last frost date in spring for summer and fall blooms. For earliest flowering, start seeds indoors 6-8 weeks before your last frost date, then transplant outdoors once soil warms. Deadhead spent flowers to encourage continuous blooming throughout the growing season.

How long do Azumi XL Blue flowers last in a vase?▼

Azumi XL Blue flowers typically last 7-10 days in a vase when properly conditioned and cared for. Place fresh stems in cool water (65-72°F) immediately after cutting, change water every 2-3 days, and keep in a cool location away from direct heat and ripening fruit to extend vase life.