Strawberry in Zone 8B — Desert Southwest

Strawberries are a true taste of spring, and well worth the effort to grow your own here in the Desert Southwest. Nothing beats the flavor of sun-ripened berries picked fresh from your garden, and they're incredibly versatile for everything from jams and desserts to fresh snacks. Plus, the satisfaction of harvesting your own fruit, even in our challenging climate, is hard to beat!

Desert gardening definitely comes with its hurdles. The extreme heat and alkaline soil can be tough on many plants. But with careful timing during our mild periods and smart watering strategies, you can absolutely enjoy a successful strawberry harvest during our 279-day growing season.

Transplant your strawberry plants outdoors from mid February through early March. This timing allows them to establish before the worst of the summer heat arrives. Make sure to harden off your transplants by gradually exposing them to outdoor conditions for about a week before planting them in their final location.

Space your strawberry plants 12-18 inches apart. This gives them plenty of room to spread and produce. Keep an eye out for late frosts during this period. While strawberries are frost-hardy, a sudden cold snap can still stress young transplants.

Strawberries need consistent moisture, especially when they're fruiting. Aim to keep the soil consistently moist, but not waterlogged. Drip irrigation is ideal, delivering water directly to the roots and avoiding wet foliage, which can lead to fungal problems in our arid climate. Mulch heavily around your plants to help retain soil moisture and keep the roots cool during our extreme summer heat.

During the spring growing season, water deeply about 1-2 inches per week, depending on rainfall. As the temperatures rise into the 90s and beyond, you'll likely need to increase watering to 2-3 inches per week, or even more frequently, especially during the hottest stretches. Use the finger test to check soil moisture: stick your finger about 2 inches into the soil. If it feels dry, it's time to water.

Always water at the base of the plants to avoid wetting the foliage. Overhead watering can create a humid environment around the leaves, even in our dry air, which can encourage fungal diseases. Signs of underwatering include wilting leaves and dry, crumbly soil. Overwatering can lead to yellowing leaves and root rot.

Strawberry pruning is pretty straightforward. Focus on removing runners, which are the long stems that the plant sends out to create new plantlets. Cutting these runners directs the plant's energy into fruit production rather than vegetative growth. You can either snip them off as they appear throughout the growing season or allow a few to root if you want to propagate new plants.

If you're growing June-bearing strawberries (which produce one large crop per year), renovate the beds after harvest by mowing or cutting back the foliage to about an inch above the crown. This encourages new growth and prepares the plants for the next season. As the first frost approaches in early December, you can remove any remaining dead or damaged foliage to help prevent disease over the winter.

You can expect your first strawberry harvest from mid May through late June, about 90 days after transplanting. The berries are ready to pick when they are fully red, fragrant, and have no white or green shoulders. Gently twist or snip the berry from the plant, leaving the green cap attached.

Harvest in the morning for the best flavor, as the sugars will be most concentrated then. Pick frequently, every few days, to encourage continued production. Strawberries will not ripen off the vine, so only harvest fully ripe berries.

As the first frost approaches in early December, harvest any remaining ripe or nearly ripe berries. While the plants themselves are frost-hardy, the fruit will be damaged by freezing temperatures. Consider covering your plants with a frost blanket if a hard freeze is predicted to extend the harvest a little longer.

Gray Mold

• What it looks like: Fuzzy gray mold on berries, leaves, and stems. Berries may rot and become mushy.
• What causes it: A fungal disease that thrives in humid conditions. Even though we're arid, monsoon moisture can still create problems.
• How to fix/prevent it: Improve air circulation by spacing plants properly and pruning out dense foliage. Remove and destroy infected plant parts. Avoid overhead watering.

Slugs

• What it looks like: Irregular holes in leaves, especially low-growing plants. Silvery slime trails on leaves and soil. Damage worse at night and in wet weather.
• What causes it: Gastropods that feed at night in moist conditions. Hide under mulch, boards, and debris during the day.
• How to fix/prevent it: Beer traps (shallow dish of beer sunk into soil). Iron phosphate bait (pet-safe). Remove hiding spots. Water in morning so soil surface dries by evening. Copper tape around beds. Diatomaceous earth around plants.

Birds

• What it looks like: Missing or pecked berries.
• What causes it: Birds love ripe strawberries!
• How to fix/prevent it: Cover plants with netting or bird netting. Use visual deterrents like shiny tape or scarecrows.

Strawberry Crown Borer

• What it looks like: Weak, stunted plants with reduced fruit production. Small white grubs inside the crown of the plant.
• What causes it: A beetle larva that tunnels into the crown of the plant, damaging its vascular system.
• How to fix/prevent it: Remove and destroy infested plants. Use row covers to prevent adult beetles from laying eggs. Introduce beneficial nematodes to the soil.

Verticillium Wilt

• What it looks like: Lower leaves yellow, wilt, and die, progressing upward. One side of plant may be affected first. Brown streaks in stem cross-section.
• What causes it: Soil-borne fungus that persists for years. Cooler soil temperatures favor it (unlike fusarium). Wide host range.
• How to fix/prevent it: No cure — remove infected plants. Rotate with non-susceptible crops (corn, grains). Solarize soil. Plant resistant varieties (look for 'V' on labels).

Desert Southwest Specific Challenges: The extreme heat of our summers can stress strawberry plants, making them more susceptible to pests and diseases. Sunscald can also be a problem, so providing afternoon shade with shade cloth is essential. Our alkaline soil can also affect nutrient uptake, so amend your soil with plenty of organic matter and consider using a fertilizer formulated for acid-loving plants. Even with our low humidity, monsoon season can bring periods of higher humidity that encourage fungal diseases.

Good companions for strawberries in the Desert Southwest include lettuce and spinach, which provide ground cover and help keep the soil cool and moist. Onions and garlic can deter pests with their strong scent. Thyme is a great herb to plant nearby as it attracts beneficial insects. Borage is another excellent choice, as it attracts pollinators and can help repel strawberry pests.

Avoid planting strawberries near broccoli, cauliflower, pepper, and tomato. These plants can compete for nutrients and water, which can be especially detrimental in our dry climate. Additionally, peppers and tomatoes are susceptible to verticillium wilt, which can easily spread to strawberries.