Vancouver Island gets almost no rain from June through September -- but the soil holds enough moisture from winter rains to grow food without irrigation. Dry farming uses that stored moisture to produce crops with zero summer watering.
Not every site works. You need deep soil, good moisture retention, and enough winter rainfall. Run this assessment to find out.
Dig down 12 inches (30cm) in late May or early June, after the last spring rains. Grab a handful of soil and squeeze it.
These crops can produce without summer irrigation when planted in properly prepared deep soil. Yields are typically 50-75% of irrigated production, but flavour is often more concentrated.
The flagship dry farming crop. Smaller, intensely flavoured fruit. Choose determinate paste and sauce varieties. Plant deep -- bury 2/3 of the stem.
Varieties: Early Girl, New Girl, Stupice, Principe Borghese, San Marzano
Spacing: 5-6 ft apart | Yield: 5-10 lb/plant | Flavour: exceptional
Deep-rooted and drought-adapted. Plant early, let vines run. Butternut and delicata do well. Wider spacing than irrigated.
Varieties: Butternut, Delicata, Kabocha, Acorn, Spaghetti
Spacing: 8-10 ft apart | Yield: 3-5 fruit/plant | Stores 4-6 months
Naturally suited to dry farming. Plant early, hill well, and harvest after die-back. Choose early to mid-season varieties.
Varieties: Yukon Gold, Kennebec, Red Norland, Warba
Spacing: 18-24 inches | Yield: 5-10 lb/plant | Early types mature faster
Ancient dry farming crop. Plant when soil is warm, harvest when pods rattle. Nitrogen fixer -- improves soil for next rotation.
Varieties: Black Turtle, Pinto, Cranberry, Soldier, Jacob's Cattle
Spacing: 6-8 inches | Yield: 0.5-1 lb dried/row ft | Store indefinitely
Small-fruited varieties do surprisingly well. Plant on south-facing slopes or against thermal mass. Need warm start.
Varieties: Minnesota Midget, Prescott Fond Blanc, Petit Gris de Rennes
Spacing: 6-8 ft apart | Yield: 2-4 fruit/plant | Start indoors
Hot peppers adapt better to dry farming than sweet. Smaller fruit, more heat. Needs warm spot with good soil depth.
Varieties: Hungarian Wax, Padron, Jimmy Nardello, Jalapeno
Spacing: 3-4 ft apart | Yield: 1-3 lb/plant | Greenhouse helps on VI
Naturally dry-farmed. Plant in fall, grows through wet winter, bulks up in spring, matures in dry summer. Perfect for VI.
Varieties: Music, Russian Red, Chesnok Red (hardneck)
Spacing: 6-8 inches | Yield: 1 head/clove | Plant Oct-Nov
Wheat, oats, rye, and buckwheat can all be dry-farmed on VI. Good for building soil and adding diversity to rotations.
Options: Red Fife wheat, hull-less oats, fall rye, buckwheat
Broadcast sow | Small-scale grain is viable at 500+ sq ft
| Site Rating | Best Crops | Possible Crops | Avoid |
|---|---|---|---|
| Excellent (deep clay-loam, high rain) |
Tomatoes, squash, potatoes, melons, peppers, beans, garlic, grains | Corn, sunflowers | Lettuce, spinach (too water-hungry) |
| Good (moderate depth loam) |
Tomatoes, squash, potatoes, beans, garlic | Peppers (with mulch), grains | Melons, corn |
| Marginal (shallow or sandy) |
Garlic, dry beans, potatoes (early types) | Tomatoes (with dust mulch) | Squash, melons, peppers |
Dry farming success is 80% soil preparation. The goal is to store winter rainfall deep in the soil profile and prevent it from evaporating before your crops can use it.
A 1-2 inch layer of dry, loose soil on the surface. It breaks the capillary action that pulls deep moisture to the surface where it evaporates. Think of it as a natural insulation layer.
After every rain or any surface watering, use a hoe or wheel hoe to lightly scratch the top 1-2 inches of soil between plants. Keep this layer loose and dry. Do not disturb deeper soil. Cultivate every 1-2 weeks through the dry season.
Stop cultivating when plants canopy over and shade the soil themselves. The leaf canopy takes over the evaporation prevention role.
Dry farming is a year-round system. Here is the full cycle for Vancouver Island.
Deep till (Year 1 only). Add compost, lime, biochar. Sow cover crop. Plant garlic.
Cover crop grows. Soil absorbs winter rain. Moisture builds in deep profile. Plan crops and order seeds.
Terminate cover crop. Shallow cultivate. Transplant after last frost. One establishment watering only. Start dust mulch.
No irrigation. Maintain dust mulch weekly. Crops access deep stored moisture. Harvest as crops mature. Expect smaller but more flavourful produce.
Dry-farmed crops need wider spacing than irrigated crops. More space per plant means each plant has a larger soil moisture reservoir to draw from.
Yields: Expect 50-75% of irrigated yields in Year 1. This improves as soil biology and structure develop. By Year 3, yields often reach 70-85% of irrigated.
Flavour: Dry-farmed tomatoes are famous for concentrated, intense flavour. Less water means more sugar and acid in a smaller package. Chefs and farmers market customers pay a premium.
Appearance: Fruit will be smaller. This is normal. Dry-farmed tomatoes are typically half the size of irrigated, with thicker skin and denser flesh.
Stress signals: Some wilting in afternoon heat is normal. If plants are still wilted in early morning, they are in trouble -- give them a deep soak and reassess your site.
Losses: Plan for 10-20% plant loss in Year 1 as you learn your site. Some spots dry out faster than others. Note these and adjust planting next year.