Hybrid

ProCut® Plum

Helianthus annuus

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

Muted plum-to-cream bicolor blooms combine well with soft or vivid colors and are every bit as early and reliable as the other well-known ProCut colors. Single-stem plants have tall, strong stems and 4-6", pollenless blooms. Another exciting introduction from US plant breeder Dr. Tom Heaton and company. Pollenless. Single stem.

Harvest

50-60d

Days to harvest

📅

Sun

Full sun

☀️

Zones

2–11

USDA hardiness

🗺️

Height

1-10 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 ProCut® Plum in USDA Zone 7

All Zone 7 flower →

Zone Map

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ProCut® Plum · Zones 2–11

What grows well in Zone 7? →

Growing Details

Difficulty

Easy

WaterModerate — regular watering

SeasonWarm season annual

ColorPlum-to-cream bicolor

Size4-6"

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

ProCut Plum is a single-stem cut-flower — each plant gives you one head, full stop, which makes succession sowing the only way to spread your harvest across more than a week or two. Direct sow every 14 days from April 1 through mid-June in zone 7; at 50-60 days to harvest, that cadence keeps blooms coming through late summer without a glut. Stop new sowings by July 1 — heads initiated when daytime highs are consistently above 90°F tend to run smaller, and anything started after that point is racing the first frost on the back end.

Complete Growing Guide

ProCut® Plum sunflowers can be started either indoors or direct sown into the garden, depending on your growing zone and desired harvest timing. For indoor sowing, start seeds four to six weeks before your last spring frost date in small pots or seed trays filled with sterile seed-starting mix. Direct sowing is equally successful and often preferred for this vigorous variety—simply plant seeds directly into the garden bed after the last frost date has passed and soil temperatures reach at least 50°F. Germination typically occurs within seven to ten days. Since ProCut® Plum reaches harvest maturity in approximately 50 days from sowing, timing your planting for mid-spring through early summer ensures you'll have blooms ready for cutting throughout the season.

Prepare your planting area by ensuring the soil drains well and contains generous organic matter worked in to a depth of eight to twelve inches. Space ProCut® Plum seeds or transplants eighteen to twenty-four inches apart, as these single-stem plants develop strong, sturdy growth and need adequate room for air circulation. Plant seeds one inch deep, pressing the soil gently over them. This variety's eventual height of six to ten feet varies by growing conditions, so spacing becomes particularly important for taller specimens that will develop robust stems capable of supporting large flower heads.

Water newly planted seeds regularly to keep soil consistently moist until seedlings establish. Once plants are actively growing, provide deep watering one to two times weekly, increasing frequency during hot spells or drought periods. ProCut® Plum appreciates consistent moisture but cannot tolerate waterlogged soil. Apply a balanced fertilizer every three to four weeks throughout the growing season, or work a slow-release granular fertilizer into the soil at planting time. The pollenless blooms of ProCut® Plum mean you can enjoy cut flowers indoors without pollen staining furniture or clothing, making this variety particularly valuable for floral arrangements.

Watch for spider mites and aphids on this cultivar, which can weaken stems and reduce stem quality prized in cut-flower production. Regular scouting and early intervention with insecticidal soap or neem oil prevents significant damage. Powdery mildew occasionally appears on sunflower foliage; ensure adequate spacing and air movement to minimize this risk. ProCut® Plum's strong stems rarely require staking in full-sun locations, but tall plants in windy areas benefit from gentle support.

The most common mistake gardeners make with ProCut® Plum is providing insufficient sunlight. These plants demand a minimum of six to eight hours of direct sun daily, with eight hours or more producing the strongest stems and the most vibrant plum-to-cream bicolor blooms. Even partial shade compromises the characteristic color saturation and stem strength that make this variety ideal for professional and home cut-flower arrangements. Plant in your sunniest available location for optimal results.

Harvesting

ProCut® Plum reaches harvest at 50 - 60 days from sowing per Johnny's Selected Seeds. Expect 4-6" at peak. As an annual, harvest continues until frost ends the season.

Seeds are ovoid and somewhat flattened

Color: Black, Brown/Copper. Type: Achene. Length: < 1 inch. Width: < 1 inch.

Garden value: Edible

Harvest time: Fall

Edibility: Seeds are used for cooking oil, livestock feed, and as a snack food or garnish. Petals are edible and young flower buds can be steamed like artichokes.

Storage & Preservation

Store ProCut Plum cut flowers in cool conditions immediately after harvest. Keep stems in fresh, clean water at 65-72°F in indirect light away from ripening fruit and ethylene sources. Change water every 2-3 days and recut stem bases at a 45-degree angle. Vase life typically ranges from 7-10 days. For preservation: dry flowers by hanging stems upside-down in a warm, dark, well-ventilated space for 1-2 weeks, or use silica gel for faster drying while maintaining color vibrancy. Alternatively, press blooms between parchment paper under weights for flat, decorative specimens.

History & Origin

ProCut® Plum is an F1 hybrid developed through controlled cross-pollination. Listed in the Johnny's Selected Seeds catalog.

Origin: Western United States

Advantages

+Muted plum-to-cream bicolor blooms pair beautifully with soft or vivid color palettes
+Pollenless flowers eliminate mess and allergen concerns for indoor arrangements
+Tall, strong single stems reach full height in just 50-60 days
+Large 4-6 inch blooms provide substantial, eye-catching flower heads
+Early maturity and reliable performance match other established ProCut varieties

Considerations

-Requires consistently tall plant support to prevent stem bending or lodging
-Bicolor pattern may fade or shift under intense summer heat stress
-Single-stem habit limits flower production compared to branching sunflower varieties

Companion Plants

Marigolds (especially Tagetes patula) along bed edges deter aphids and whiteflies through root-zone compounds, and the flowers pull in parasitic wasps that also work through the sunflower heads. Nasturtiums act as a trap crop — aphids hit them first, giving you an early-warning signal before populations build on the ProCut stems. Low-growing lettuce fills the ground under the canopy without much water or light competition, and it benefits from the afternoon shade a 4-to-6-foot sunflower throws. Fennel releases allelopathic compounds that stunt most annuals grown near it, so keep it on the far end of the garden; the same goes for any black walnut on the property, whose juglone toxicity moves through soil well past the drip line.

Plant Together

Marigolds

Repel aphids, whiteflies, and nematodes while attracting beneficial insects

Nasturtiums

Act as trap crops for aphids and cucumber beetles, protecting sunflowers

Zinnias

Attract pollinators and beneficial predatory insects like ladybugs and lacewings

Cosmos

Provide habitat for beneficial insects and complement sunflower blooming periods

Basil

Repels thrips, flies, and mosquitoes while attracting pollinators

Borage

Attracts bees and other pollinators, may improve soil health

Lettuce

Benefits from shade provided by tall sunflowers during hot weather

Beans

Fix nitrogen in soil which benefits sunflowers, can use sunflower stalks for support

Keep Apart

Black Walnut Trees

Release juglone toxin that stunts sunflower growth and can cause wilting

Fennel

Produces allelopathic compounds that inhibit growth of most companion plants

Pole Beans

May compete aggressively for nutrients and water when climbing sunflower stalks

Troubleshooting ProCut® Plum

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

Seedling stem pinched off at soil level, plant toppled overnight

Likely Causes

Damping off (Pythium or Rhizoctonia spp.) — fungal rot triggered by overly wet, poorly drained soil
Cutworms (Agrotis spp.) — larvae active at night, cut stems just below or at soil line

What to Do

1.Check the cut: a clean diagonal slice means cutworms; a mushy, collapsed stem means damping off
2.For cutworms, press a cardboard collar 2 inches into the soil around each seedling
3.For damping off, let the top inch of soil dry between waterings and improve drainage — don't sow into cold, wet beds

Leaves covered in white or gray powdery coating, usually starting on upper leaf surfaces as plants mature

Likely Causes

Powdery mildew (Golovinomyces cichoracearum) — common on sunflowers in late summer when nights cool and humidity rises
Crowded spacing that traps moisture and cuts airflow

What to Do

1.On a cut-flower crop, this is mostly cosmetic — harvest heads before mildew spreads to the bracts
2.Give plants 9-12 inches between them; ProCut Plum can be pushed to 6-inch spacing for single-stem production but tighter rows pay for it in mildew pressure
3.A baking soda spray (1 tablespoon per gallon of water with a drop of dish soap) knocks it back if you catch it early

Heads fail to open fully, petals browning or sticking together before bloom

Likely Causes

Tarnished plant bug (Lygus lineolaris) feeding on developing buds — leaves characteristic distorted florets
Extended rain or high humidity during bud stage, causing petal tissue to rot before the head opens

What to Do

1.Scout buds closely starting around day 40 — Lygus bugs move fast and are usually gone before you notice the damage
2.Row cover over young plants until bud set keeps Lygus pressure down without spraying
3.If rain is the culprit, cut earlier next time — when the back petals are just beginning to lift — and let heads finish opening somewhere dry

Frequently Asked Questions

How long do ProCut Plum flowers last after cutting?▼

ProCut Plum cut flowers typically last 7-10 days in a vase with proper care. To maximize vase life, place stems in clean water at 65-72°F, change water every 2-3 days, and recut the stem bases at a 45-degree angle. Remove any foliage below the waterline to prevent bacterial growth and keep flowers away from ripening fruit and ethylene sources.

Is ProCut Plum a good flower variety for beginners?▼

Yes, ProCut Plum is excellent for beginner growers. It's noted for being reliable and early-blooming, requiring only full sun (6+ hours daily) and having an easy difficulty rating. Single-stem plants produce tall, strong stems with consistent 4-6" pollenless blooms, making them straightforward to grow and harvest without specialized experience.

When should I plant ProCut Plum flowers?▼

Plant ProCut Plum after the last frost date in your region, as it's a warm-season flower. This timing ensures soil and air temperatures are warm enough for optimal growth. Seedlings started indoors 6-8 weeks before the last frost can be transplanted outdoors once frost danger has passed for earlier blooms.

Can ProCut Plum flowers be grown in containers?▼

While specific container requirements aren't documented, many cut flower varieties including ProCut Plum can be grown in containers with adequate depth for root development. The key is ensuring containers receive full sun (6+ hours daily) and using well-draining soil. Container-grown plants may need more frequent watering and feeding due to limited soil volume.

What makes ProCut Plum different from other ProCut varieties?▼

ProCut Plum features unique muted plum-to-cream bicolor blooms that coordinate beautifully with both soft and vivid color palettes. Like other ProCut varieties, it's early and reliable, but the distinctive bicolor coloring and pollenless flowers set it apart, making it ideal for floral arrangements where pollen transfer is a concern.

How many flowers does a single ProCut Plum plant produce?▼

ProCut Plum is a single-stem variety, meaning each plant produces one primary flowering stem rather than multiple side shoots. However, with proper pinching or disbudding techniques, some growers can encourage branching. Each stem produces 4-6" pollenless blooms and reaches harvest maturity in 50-60 days.