Sweet Peas: How to Plant, Grow, and Care for Fragrant Climbers

Sweet peas enchant with fragile, seductive fragrance and make great bouquets. Pea-like flowers in many lovely colors suit annual borders, woodland gardens, trellises, or arches.

Sweet Pea
(Delicate Pleasures)
"Here are sweet peas, on tip-toe for a flight
With wings of gentle flush o'er delicate white,
And taper fingers catching at all things
To bind them all about with tiny rings."
—John Keats (1795–1821)

Cultivated sweet peas date back 300+ years. In native Sicily, weak stems and intense orange-jasmine-honey scent. Modern hybrids: stronger stalks, larger blooms.

Growing sweet peas is like making piecrust—some have the knack, others don't. Hardy from large, easy-to-handle seeds, but tricky due to slow germination. Experiment with different seeds yearly.

Planting Sweet Peas

• Early sowing is key. Zone 7 or colder: plant very late winter/early spring as soon as soil is workable (don't wait for frost). Coldest areas: start indoors in six-packs/Jiffy pots. Harden off ≥1 week, then set out when soil works. Mild winters (Zones 8–10): plant late fall for late winter/early spring bloom.
• Sweet peas like heads in sun, roots in cool, moist soil. Plant low annuals in front to shade roots.
• Well-drained site. Alkaline soil best; sprinkle powdered lime if soil tends acidic.
• Prepare rich soil: generous compost + well-rotted manure to 2 feet deep.
• Dig 4-inch deep trench before planting.
• Make holes with pencil, drop seeds, firm soil to exclude light.
• Soak seeds 24 hours pre-planting. Nick with nail file to speed sprouting. (Not needed in temperate climates.)

Care

• Germination: 7–15 days depending on soil temperature.
• As seedlings emerge, gradually fill trench—hoe soil up to them.
• Keep soil moist. Summer rain may suffice. Test: finger to first joint—if dry, water at soil level in morning; sweet peas suffer bud drop if dry.
• If ample aged manure/compost used at planting, no fertilizer needed. If feeding, use high potash; nitrogen encourages excessive top growth.
• Prefer cool days/nights; fade above 65°F.
• Except bush types, sweet peas are real climbers. Provide ≥6 feet support. Some climb 9–10 feet. No fence/trellis? Use brush, chicken wire, or bushy twigs.
• Once established, mulch well for cool, moist soil. May not need watering if mulched unless soil dries.
• For bushy growth, pinch tops at 6 inches (not before—causes premature side shoots).
• Pick flowers often for bouquets—plant puts energy into more blooms, not seeds. Harvest when lowest blossom just opens.

Pests and Diseases

• Slugs/snails attack young growth.
• Pythium root rot, powdery mildew, rust, gray mold, leaf spots common.

Recommended Varieties

• 'April in Paris' — fragrant modern, large creamy-yellow blossoms with lilac shading.
• 'America' — deliciously scented heirloom (1896), stunning wavy red and white stripes.
• Breeders now offer old-fashioned perfume + heat resistance. Seek heirlooms like 'Old Spice' collection from Sicily: white, cream, pink, lavender, purple shades.

Wit & Wisdom

• Sweet pea essential in late-Victorian gardens—loved for color diversity and fragrance.
• Gather flowers in morning when dew is on them—scent is sweetest.
• Sweet peas are April birth flowers.

"The odor of the sweet pea is so offensive to flies it will drive them out of a sick-room, though not disagreeable to the patient."
—Tip from The 1899 Old Farmer's Almanac