Hybrid

Sunrich Lime

Helianthus annuus

a white flower with green leaves in front of a blue sky

Wikimedia Commons via Common sunflower

Bright, lemon-yellow petals surround a lime-green disk. This highly uniform series is great for succession planting with the ProCut® series. 4-6" bloom size. Pollenless. Single stem.

Harvest

60-70d

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 Sunrich Lime in USDA Zone 7

All Zone 7 flower →

Zone Map

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Sunrich Lime · Zones 2–11

What grows well in Zone 7? →

Growing Details

Difficulty

Easy

Spacing18-24 inches

SoilWell-drained soil, amended with compost for clay soils

WaterModerate — regular watering

SeasonWarm season annual

ColorLemon-yellow petals with lime-green disk

Size4-6"

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

Sunrich Lime throws one bloom per stem, so if you want a continuous supply you have to stagger your sowings — a single planting gives you one flush and that's it. In zone 7, direct sow every 14 days from April 1 through late June. At 60-70 days to harvest, a late-June sowing flowers in early September, which is about as far as you want to push before shortening days slow things down noticeably. Check soil temperature before your first sowing — germination is unreliable below 55°F and hits its stride between 65-70°F.

If you're starting indoors, sow in 3- or 4-inch cells no more than 2-3 weeks before your transplant date. Sunflowers get root-bound fast and transplant better small. Honestly, direct sowing is simpler for most people — just keep the bed consistently moist for the first 7-10 days until germination is complete.

Complete Growing Guide

Sunrich Lime sunflowers are best started through direct sowing after all danger of frost has passed and soil temperatures reach at least 50°F. Since these plants reach harvest maturity in just 60 days, you can sow seeds directly into the garden two to three weeks after your last spring frost date. For successive blooms throughout the season, consider staggering plantings every two weeks until mid-summer. If you prefer to get a head start, you can sow indoors four to six weeks before your last frost, though direct sowing typically produces stronger root systems for these sturdy plants.

Prepare your garden bed by working in compost or well-draining potting soil to a depth of at least one foot. Sunrich Lime performs best in neutral to slightly alkaline soil with good drainage. Sow seeds one inch deep and space them twelve to eighteen inches apart, depending on whether you want a more densely planted display or individual specimen plants. The variety's impressive height range—from 1.5 to 10 feet depending on growing conditions—means spacing matters for air circulation and preventing crowding as plants mature.

Water deeply and consistently throughout the growing season, providing approximately one inch of water per week through rainfall or irrigation. These plants prefer soil that's moist but not waterlogged. Once established, reduce watering frequency but increase depth to encourage deep root development. Feed with a balanced, slow-release fertilizer when plants reach six inches tall, and consider a second feeding when flower buds begin to form. The lime-green disk center is particularly sensitive to nutrient stress, so consistent feeding prevents discoloration.

Watch vigilantly for sunflower beetles and stem weevils, which are drawn to the large flower heads and thick stems of tall varieties like Sunrich Lime. Check stems regularly for entry holes and sawdust-like frass. The pollenless characteristic of this variety reduces attraction to some pollinators and pests, but spider mites can still pose problems during hot, dry periods. Maintain consistent soil moisture to deter these mites. Powdery mildew occasionally appears on lower foliage as plants mature; improve air circulation by removing lower leaves on taller specimens.

Succession planting is particularly effective with Sunrich Lime because of its 60-day harvest window and compatibility with the ProCut series. Plan staggered sowings to ensure continuous blooms from mid-summer through early fall. Stake or support taller specimens, especially in windy locations, using soft ties that won't damage stems.

The critical mistake gardeners make with Sunrich Lime is overcrowding plants hoping to maximize the flower display. While the variety is rated as easy to grow, stunted growth and poor flower development result from inadequate spacing. Remember that these plants need room to develop their full potential, whether you're growing compact 1.5-foot plants or allowing them to reach their maximum height.

Harvesting

Sunrich Lime reaches harvest at 60 - 70 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

Fresh-cut Sunrich Lime stems last longest when kept in cool conditions (65-70°F) away from direct sunlight and ethylene sources like ripening fruit. Fill a clean vase with fresh water mixed with floral preservative (or a homemade alternative: 1 teaspoon sugar + a few drops of bleach per quart). Change water every 2-3 days and re-cut stems at a 45-degree angle. Properly stored, cut stems remain vibrant for 10-14 days.

For drying, hang fresh stems upside-down in a warm, dark, dry location (60-70°F with low humidity) for 2-3 weeks. Dried Sunrich Lime flowers retain their distinctive color and work beautifully in floral arrangements, wreaths, and crafts. Alternatively, press flowers between parchment for 2-3 weeks under heavy weight for botanical art projects. Store dried material in airtight containers in a cool, dry space for long-term preservation.

History & Origin

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

Origin: Western United States

Advantages

+Bright lemon-yellow petals with lime-green disk create striking visual contrast
+Pollenless variety reduces allergen concerns for florists and sensitive customers
+Highly uniform series enables consistent succession planting and reliable crop scheduling
+4-6 inch blooms fit standard vase arrangements without requiring size reduction
+Easy difficulty rating makes this suitable for novice growers

Considerations

-Single stem limits yield per plant compared to branching varieties
-Lime-green disk may fade or brown as flowers age in arrangements
-60-70 day maturity requires longer production timeline than quick turnaround crops
-Bright coloring can attract more pest pressure than darker sunflower varieties

Companion Plants

Marigolds and nasturtiums pull real weight near sunflowers. French marigolds (like 'Petite Gold') produce root secretions that deter aphids and whiteflies — worth caring about because sunflower aphid (Aphis helianthi) can colonize stems fast once temperatures climb. Nasturtiums work differently: they're a trap crop that draws aphids away from your sunflowers while also pulling in lacewings and hoverflies that clean up infestations. Beans are worth fitting in nearby too — they fix nitrogen without competing much at root depth, and if you keep them on the south side they won't shade the sunflowers out.

Black walnut trees are the hard no. Walnut roots release juglone, a compound that accumulates in the soil and stunts or kills plants growing within that zone — sunflowers are sensitive to it. Fennel is a problem for different reasons: it produces allelopathic compounds that suppress germination and slow the growth of most neighboring plants. Give it its own isolated bed and keep it well away from your cutting rows.

Plant Together

Marigolds

Repel aphids, whiteflies, and nematodes while attracting beneficial insects

Nasturtiums

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

Beans

Fix nitrogen in soil and can climb sunflower stalks for support

Cucumbers

Benefit from sunflower shade and wind protection

Lettuce

Thrives in partial shade provided by tall sunflower stems

Radishes

Help break up soil and deter root pests around sunflower base

Cosmos

Attract pollinators and beneficial predatory insects

Zinnias

Complement sunflowers aesthetically and attract butterflies and bees

Keep Apart

Black Walnut Trees

Release juglone toxin that stunts sunflower growth and causes wilting

Potatoes

Compete for similar nutrients and may increase risk of fungal diseases

Fennel

Produces allelopathic compounds that inhibit sunflower germination and growth

Troubleshooting Sunrich Lime

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

Seedling stem pinched or collapsed at soil level, plant topples over

Likely Causes

Damping off (Pythium or Rhizoctonia spp.) — fungal rot triggered by cold, wet soil and poor airflow
Overwatering before the first true leaves appear

What to Do

1.Pull the affected seedlings and throw them out — they won't recover
2.Let the top inch of soil dry out between waterings, especially in trays indoors
3.If starting seeds indoors, use a sterile seed-starting mix and make sure your tray has drainage holes

Leaves stippled with tiny pale dots, fine webbing visible on the undersides

Likely Causes

Two-spotted spider mite (Tetranychus urticae) — population explodes in hot, dry stretches above 90°F
Dusty conditions on leaves, which mites prefer

What to Do

1.Spray undersides of leaves hard with water from a hose to knock mites off — do this in the morning so leaves dry before evening
2.Apply insecticidal soap or neem oil every 5-7 days until the stippling stops spreading
3.Keep the area around plants watered; dusty, dry conditions are what let mite populations get out of hand

Circular gray-white powdery patches on upper leaf surfaces, usually appearing mid-summer

Likely Causes

Powdery mildew (Erysiphe cichoracearum) — common on sunflowers in humid conditions with warm days and cool nights
Crowded spacing that traps moisture and cuts airflow

What to Do

1.Space plants at least 18 inches apart — 24 is better if you've had mildew problems before
2.Apply a potassium bicarbonate spray or diluted neem oil at first sign; it won't erase existing patches but slows spread
3.Skip aggressive treatment if plants are within 2-3 weeks of harvest — the yield loss from mildew at that stage rarely justifies the effort

Flower heads drooping or failing to open, buds chewed or showing small exit holes

Likely Causes

Sunflower moth (Homoeosoma electellum) — larvae bore into developing flower heads
Sunflower headclipping weevil (Haplorhynchites aeneus) — severs the stem just below the bud

What to Do

1.Scout buds starting around day 50 — look for frass (sawdust-like droppings) at the base of the head as an early sign of moth larvae
2.For weevil damage, remove and destroy clipped heads so larvae can't complete their cycle in your soil
3.If pressure is heavy, apply spinosad at bud stage — it's effective against moth larvae and lower-risk for beneficial insects than pyrethroids

Frequently Asked Questions

How long does Sunrich Lime sunflower take to grow from seed to bloom?▼

Sunrich Lime matures in 60-70 days from sowing to first flower. If you start seeds indoors 4-6 weeks before your last spring frost, transplant after hardening off, and move them outside, you'll typically see blooms within 8-10 weeks total from initial seeding. Direct sowing after frost follows the same 60-70 day timeline. Successive plantings every 2 weeks provide continuous blooms throughout summer and into fall.

Is Sunrich Lime sunflower good for beginners?▼

Yes—Sunrich Lime is excellent for beginning gardeners. It's classified as easy difficulty, requires only full sun and basic watering, and its single-stem form eliminates the need for pruning or staking. The hybrid simply needs consistent moisture, decent soil drainage, and sunlight. Even first-time growers typically achieve reliable blooms with minimal intervention.

Can you grow Sunrich Lime sunflowers in containers or pots?▼

Yes, though it's less common. Use a large container (at least 12 inches deep and 10-12 inches wide) with quality potting soil and excellent drainage. Growing in containers restricts root development, potentially reducing stem length and bloom size, but the plant will still flower. Place containers in full sun, water consistently (containers dry faster than ground), and apply balanced fertilizer every 3-4 weeks. Container-grown plants are ideal for patios and small spaces.

What is the lime-green disk on Sunrich Lime sunflowers?▼

The disk is the central reproductive portion of the sunflower bloom—normally dark brown or black in traditional sunflowers. Sunrich Lime was specifically bred to display a distinctive lime-green disk, creating striking color contrast with its lemon-yellow petals. This is the flower's center; it contains no pollen (pollenless variety) and serves as a distinctive aesthetic feature for cut-flower arrangements.

When should I plant Sunrich Lime sunflower seeds?▼

Direct sow seeds outdoors after your last spring frost when soil temperature reaches 50°F or higher. Alternatively, start indoors 4-6 weeks before your last frost date, then transplant seedlings outside after hardening off. For continuous summer blooms, succession plant every 2 weeks through mid-July. In warm climates, you can extend into late summer; in short-season areas, focus plantings early to ensure blooms before first fall frost.

How often should I water Sunrich Lime sunflowers?▼

During establishment and bloom, provide consistent moisture equivalent to about 1 inch of water per week through rainfall or irrigation. Water deeply but allow soil surface to dry slightly between waterings—sunflowers dislike waterlogged soil. In hot climates, you may need to water 2-3 times weekly. Once established, they tolerate some drought, but regular watering produces fuller stems and larger, longer-lasting blooms.