Harrisburg Yardlong Bean Calendar

Direct Sow

May 10 - June 15

Soil must be 70°F+; 2-3 weeks after last frost [citation:1][citation:7]

Succession Planting

Every 3-4 weeks

Until early July for extended harvest [citation:4]

Fall Planting

Not Recommended

Needs 80+ days of heat; Harrisburg fall too cool [citation:2][citation:8]

Harrisburg Pro Tip

Yardlong beans are heat lovers – they thrive in our hot, humid summers when bush beans start to fade [citation:3][citation:7]. Wait until soil is thoroughly warm (70-75°F) before planting, usually late May [citation:7][citation:10].

Choosing Yardlong Bean Varieties

Several beautiful and productive varieties are available:

Orient Wonder Dark Green Red Noodle Purple Podded Thai Green Black

Green Varieties

Orient Wonder, Dark Green: Classic 15-20" pods, tender and crisp. Most common and reliable [citation:4][citation:7].

Purple/Red Varieties

Red Noodle, Purple Podded: Stunning color turns green when cooked. Same great flavor [citation:4][citation:9].

Heirloom Types

Black, Thai varieties: Traditional strains with excellent heat tolerance and unique flavors [citation:8][citation:10].

Soil Preparation & Planting

Soil Requirements

  • pH: 6.0-7.0 (slightly acidic to neutral) [citation:2][citation:3]
  • Texture: Well-draining, fertile loam enriched with compost [citation:2]
  • Temperature: Soil must be 70-75°F for germination; wait until late May [citation:7][citation:10]
  • Location: Full sun all day (8+ hours) – they need all the heat they can get [citation:4][citation:6]

Planting Instructions

  1. Direct sow only: Roots are sensitive; do not transplant [citation:4][citation:7]
  2. Planting depth: 1 inch deep [citation:7][citation:8]
  3. Spacing: 4-6 inches apart in rows 24-36 inches apart [citation:2][citation:7]
  4. Thinning: Thin to 6-8 inches apart when seedlings are 4 inches tall [citation:8]
  5. Inoculant: Use cowpea inoculant if available; helps nitrogen fixation [citation:2][citation:7]
70°F
Minimum soil temp
75-85°F
Ideal soil temp
7-10 days
Germination time

Trellising: Absolutely Essential

Yardlong beans are vigorous climbers reaching 8-12 feet tall. Install trellis at planting time [citation:2][citation:7].

Teepee Trellis

7-8 foot poles tied at top. Easy to build and harvest from both sides [citation:9].

Vertical Trellis

8-foot fence or cattle panels. Beans need thin poles (under 2" diameter) to twine around [citation:7][citation:9].

A-Frame

Sturdy and provides good air circulation, reducing disease risk in humid Harrisburg summers.

Key: Without strong support, plants become tangled, pods curl, and harvest is difficult [citation:2][citation:3].

Care During Growing Season

1

Watering

1 inch per week; water deeply at base. Consistent moisture critical during flowering and pod formation. Avoid overhead watering [citation:4][citation:7].

2

Mulching

Apply 2-3 inches of straw or leaves after plants are established. Conserves moisture and keeps roots cool during heat waves [citation:6].

3

Fertilizing

Yardlong beans fix nitrogen. Use low-nitrogen fertilizer; too much N = leaves, few beans. Compost at planting is sufficient [citation:2][citation:4].

4

Training

Help young vines find the trellis. They twine counter-clockwise – gently wrap around supports [citation:3].

Harrisburg Pest & Disease Control

Common Pests Common Diseases Prevention

Issues in Our Area

  • Aphids: Blast with water, use insecticidal soap, encourage ladybugs [citation:4][citation:8]
  • Leafhoppers: Can cause severe yield loss. Use row covers early, remove plant debris [citation:2]
  • Spider Mites: Increase in dry, dusty conditions. Keep plants well-watered, hose off leaves [citation:7][citation:8]
  • Powdery Mildew: Common in humid weather. Ensure good air circulation, water at base [citation:3]
  • Mexican Bean Beetle: Hand pick eggs/larvae, use row covers, plant resistant varieties [citation:2]
Harrisburg-specific: Our humid summers favor fungal diseases. Space plants well, water in morning, and provide good trellis airflow [citation:3][citation:7].

Harvesting Yardlong Beans

When to Harvest

  • Days to maturity: 60-80 days after planting, depending on variety [citation:2][citation:10]
  • Pod size: Harvest when 12-18 inches long, still thin (pencil diameter) [citation:3][citation:7]
  • Test: Pod should snap crisply; if seeds are bulging, it's too late [citation:3][citation:7]
  • Frequency: Harvest every 2-3 days; plants produce for 4-6 weeks [citation:4][citation:6]

Harvest Method

  • Use scissors or pruners: Pulling can damage vines [citation:7]
  • Morning harvest: Pods are crispest and most flavorful then
  • Keep picking: Regular harvest encourages more production [citation:4][citation:7]

Storage & Use

Use fresh within a few days, or blanch and freeze. Store in fridge 5-7 days in plastic bag. Excellent in stir-fries, curries, and salads [citation:2][citation:7].

Seed Saving for Next Year

Yardlong beans are open-pollinated; you can save seeds easily [citation:8][citation:10].

Steps

  1. Allow pods to mature fully on vine until brown and dry [citation:5][citation:8]
  2. If frost threatens, pull plants and hang upside down to dry indoors [citation:8]
  3. Shell beans when pods are completely dry and seeds rattle
  4. Dry seeds further for 1-2 weeks out of sun
  5. Store in cool, dark place in airtight container; lasts 2-3 years [citation:5]

Note: Save seeds from healthiest, most productive plants. Avoid saving from hybrid varieties [citation:5].

End of Season & Crop Rotation

Fall Cleanup

  • After frost: Plants will die – remove all debris to prevent disease carryover [citation:3]
  • Leave roots: They fix nitrogen; till in for soil improvement [citation:2]
  • Compost: Healthy plants only – discard diseased material

Rotation

  • Don't plant yardlong beans or other legumes in same spot for 3-4 years [citation:2]
  • Follow with heavy feeders like corn or tomatoes