← Plant Guides

How to Grow Bigflower Vetchling

Bigflower Vetchling

Lathyrus grandiflorus

vine

Bigflower vetchling is a perennial climbing vine in the legume family, prized for its large, showy pink and purple bicolored flowers that bloom throughout the growing season. Native to Southern Europe, it features delicate tendrils and compound leaves, making it an attractive ornamental for trellises, arbors, and garden borders. The fragrant flowers attract pollinators and add vertical interest to gardens.

When should you plant Bigflower Vetchling in your zone?

Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.

Get my Bigflower Vetchling timeline →

Example Bigflower Vetchling timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Bigflower Vetchling

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. Harvest Bigflower Vetchling

    Around Jun 16

    ≈ 60 days after planting

Sample dates for Pittsburgh, PA. Sign up to get exact Bigflower Vetchling dates for your own zip code.

Growing Conditions

☀️
Sun: Full sun to partial shade, 6+ hours of direct sunlight daily
💧
Water: Moderate watering; keep soil consistently moist but not waterlogged. Once established, fairly drought-tolerant. Water at the base to avoid fungal issues.
📏
Spacing: 12 inches
📅
Days to maturity: 60-90 days to first flowers from seed
🌱
Planting depth: 0.5

Soil

Type: Well-draining loamy to sandy soil
pH: 6.0-7.0
Amendments:
Compost Peat moss or coconut coir Perlite for drainage

Growing Zones

Find your zone →

Thrives in zones 6-10, with best performance in zones 7-9

6a 6b 7a 7b 8a 8b 9a 9b 10a

Sign up free to see if Bigflower Vetchling grows in your zone — and get a personalized planting timeline.

Get my Bigflower Vetchling timeline →

Growth Stages

1

Seedling

2-3 weeks

Delicate seedlings emerge with rounded cotyledons and small compound leaves beginning to form.

Keep soil consistently moist. Provide bright indirect light. Thin seedlings to proper spacing once they have 2-3 true leaves. Consider scarifying seeds or soaking in warm water 24 hours before planting to improve germination.

2

Vegetative Growth

4-6 weeks

Vine develops climbing tendrils and compound leaflets. Plant grows vigorously, producing multiple stems with increasingly mature foliage.

Install support structure early (trellis, stakes, or arbor). Fertilize monthly with balanced or slightly nitrogen-rich fertilizer. Pinch back tips to encourage bushier growth if desired. Keep well-watered during dry spells.

3

Budding & Early Flowering

2-3 weeks

Flower buds form at leaf axils, developing into characteristic pink-and-purple bicolored blooms. First flowers appear.

Switch to lower-nitrogen, higher-phosphorus fertilizer to promote flowering. Ensure consistent moisture. Deadhead spent flowers to encourage continuous blooming. Maintain adequate support as the vine becomes heavier.

4

Peak Flowering

6-10 weeks (or longer with deadheading)

Abundant large, fragrant flowers in shades of pink and purple cover the vine. Blooms continue prolifically throughout the season.

Continue deadheading for extended flowering. Water deeply during hot, dry weather. Monitor for pests. Enjoy the fragrance and pollinator activity. Light feeding every 3-4 weeks maintains vigor.

5

Seed Development & Decline

4-6 weeks until frost or natural end of season

If flowers are not deadheaded, seed pods develop. Foliage may begin to decline as plant diverts energy to seed production.

Collect seed pods if you wish to save seeds for next year. Allow some flowers to go to seed to ensure self-sowing. Cut back dead or damaged growth. Reduce watering as plant naturally slows.

Companion Planting

Plan your garden →

Plant with:

Clematis Roses Lavender Salvia Russian Sage Catmint Ornamental grasses

Avoid planting near:

Fennel Onion family plants (competitive for resources in close quarters)

Common Pests

  • Spray with strong water stream to dislodge; use insecticidal soap or neem oil if infestation is severe. Encourage beneficial insects like ladybugs.

  • Increase humidity and mist foliage. Use miticide or neem oil. Ensure adequate watering.

  • and

    Hand-pick, especially at night. Use beer traps or copper barriers. Apply organic slug pellets if needed.

  • Ensure good air circulation. Avoid overhead watering. Apply sulfur dust or fungicide at first sign of white coating on leaves.

Uses

🌿

Garden Beautification & Vertical Interest

Ornamental

Bigflower vetchling is an excellent ornamental vine for creating living screens, decorating arbors, trellises, and pergolas. Its fragrant, showy bicolored flowers provide months of color and attract butterflies, bees, and other pollinators, enhancing garden biodiversity. [source]

🦋

Pollinator Support

Wildlife

The abundant nectar-rich flowers make this plant a valuable resource for honeybees, bumblebees, hoverflies, and butterflies throughout the growing season. Its role as a pollinator plant enhances overall garden productivity and ecosystem health. [source]

🏠

Cut Flowers & Floral Arrangements

Household

The fragrant, long-lasting flowers are excellent for cutting and bringing indoors for fresh bouquets and arrangements. They maintain their beauty in water for several days, making them suitable for decorative displays. [source]

🎨

Seed Saving & Propagation

Craft

Gardeners can easily collect mature seed pods from this vine to save seeds for next season or share with other gardeners. The large seeds are easy to handle and store, making seed saving a rewarding and sustainable practice. [source]

Harvest Tips

For ornamental purposes, no harvest is needed. For seed collection, allow seed pods to mature and dry on the vine, then harvest when pods turn brown and papery. Collect seeds before pods split naturally and scatter them. Store dry seeds in cool, dry conditions for spring planting. Cut flowers can be harvested for arrangements and will continue to bloom if deadheaded regularly.

Fun Facts

  • 🌱 Bigflower vetchling is a nitrogen-fixing plant, meaning its roots host bacteria that convert atmospheric nitrogen into a form usable by plants, naturally enriching the soil without synthetic fertilizers.
  • 🌱 The flowers exhibit a unique bicolored pattern with pink outer petals and purple inner petals, creating a striking visual that attracts different types of pollinators.
  • 🌱 In cooler climates, bigflower vetchling is often grown as an annual, while in warmer zones it behaves as a true perennial vine that can survive winter dormancy and resprout vigorously each spring.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Deadhead Full Sun Germination Partial Shade Perennial pH Pinch Back Trellis True Leaves
Shop Bigflower Vetchling plants and related plants at Plant Addicts →

Join 30,000 gardeners planning their gardens with LizPlants.

Get your personalized Bigflower Vetchling planting timeline

Tell us your zip code and we'll calculate exactly when to start Bigflower Vetchling seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.

Get my Bigflower Vetchling timeline →