How to Grow Strawberries in a Greenhouse

Enjoy sweet, homegrown strawberries months before they appear in your local garden. This guide covers everything from choosing the best varieties to pollinating flowers and keeping pests away for a bountiful harvest. #GreenhouseGardening #GrowStrawberries #HomegrownFood #DIYGarden #YearRoundHarvest

A few years ago, I was tired of waiting for summer to enjoy fresh strawberries. So, I decided to try growing them in my greenhouse, and the results were incredible.

I was picking ripe, juicy berries in late spring while my outdoor plants were just starting to flower. It was a game-changer. Now, I want to share what I have learned so you can enjoy the same success.

Choosing the Best Strawberry Varieties for Your Greenhouse

Picking the right variety is the most important first step. Not all strawberries are created equal, especially for greenhouse growing.

Here are the three main types you need to know about :

Type	How It Fruits	Best For
June-Bearing	Produces one large, heavy crop over 2-3 weeks in early summer.	A single, big harvest for making jam or freezing.
Everbearing	Produces two main harvests, one in early summer and another in early fall .	A spread-out harvest over a longer season.
Day-Neutral	Fruits continuously as long as temperatures stay between 35°F and 85°F.	Year-round production in a greenhouse.

🌱 Top Varieties to Try

For Beginners & Year-Round Fruit: Day-neutral varieties like ‘Albion’, ‘Seascape’, and ‘San Andreas’ are known for producing large, sweet berries consistently. ‘Tristar’ and ‘Tribute’ are also popular choices.
For a Classic, Reliable Crop: ‘Cambridge Favourite’ is a forgiving and reliable choice that thrives in various conditions. ‘Honeoye’ is another excellent June-bearer known for high yields .

My personal experience: I started with day-neutral varieties like ‘Albion’ and ‘Monterey’. They turned out to be real champions, producing large, sweet berries even as the daylight decreased.

Preparing Your Greenhouse

Before you plant, you need to get your greenhouse ready. This creates a clean, healthy environment for your strawberries to thrive.

Clean and Disinfect: Wash the greenhouse structure, benches, and pots with a mild bleach solution. This kills any disease spores or hidden pests from previous seasons.
Test and Amend Soil: Strawberries prefer slightly acidic soil with a pH between 5.5 and 6.5. If you are planting in the ground, use a soil test kit to check the pH and adjust if needed.
Improve Drainage: Strawberries hate wet feet. Ensure your planting area has good drainage. Use raised beds, grow bags, or containers with drainage holes.

Planting Your Strawberries

When to Plant

Bare-root runners are best planted in autumn.
Potted plants can be planted in early spring.

How to Plant

Spacing: Give your plants room to grow. Space them about 12-18 inches (30-45 cm) apart.
Planting Depth: This is crucial. Plant the strawberry so the crown is just above the soil surface. If you bury the crown, it will rot.
Containers: If using pots, choose containers that are 10 to 18 inches deep and at least 12 inches wide. You can plant up to four strawberry plants per 12-inch diameter pot.

Caring for Your Plants

💧 Watering

Strawberries need consistent moisture but do not like to be waterlogged. Water at soil level in the morning to avoid wetting the leaves and flowers, which can encourage disease . A drip irrigation system is ideal.

☀️ Light

Strawberries need plenty of light to set fruit. Aim for at least 6 hours of sunlight daily, and ideally up to 12 hours. During short winter days, use LED grow lights to supplement natural light .

🌡️ Temperature Control

Maintaining the right temperature is key for good pollination and fruit development.

During flowering and fruit set: Aim for daytime temperatures of 60-70°F (16-20°C) and nighttime temperatures of 45-55°F (8-12°C).
General guideline: Do not let the greenhouse exceed 80°F (27°C) or drop below 35°F (2°C).

🌿 Fertilizing

Strawberries are hungry plants. Feed them regularly.

At planting: Mix a balanced organic fertilizer or slow-release fertilizer into the soil .
During the growing season: Feed every 2-4 weeks with a balanced liquid fertilizer. Once flowers appear, switch to a high-potash liquid fertilizer (like tomato feed) to encourage fruiting.

✂️ Managing Runners

Runners are the long stems that strawberry plants send out to make new plants. If you want lots of fruit, snip off runners as soon as they appear . This forces the plant to put all its energy into producing berries instead of making babies.

Pollination: You Are the Bee

In a greenhouse, there are no wind or bees to pollinate your strawberry flowers . Without pollination, you will get misshapen or no fruit. So, you have to do it yourself.

How to hand-pollinate:

Use a small, soft paintbrush.
Gently twirl the brush inside each flower you see.
Do this once a day during the flowering period to ensure good fruit set.

Pest and Disease Control

Keeping your greenhouse clean and well-ventilated is your best defense.

Common Pests: Watch out for spider mites, aphids, and slugs.
- Organic Control: Remove pests by hand. Use organic insecticidal soap or neem oil for infestations. For spider mites, biological controls like predatory mites are very effective.
Common Diseases:Grey mold (Botrytis) is a common problem, especially in humid conditions.
- Prevention: Improve airflow. Avoid overhead watering. Promptly remove any dead leaves or rotting fruit.

Harvesting Time

This is the best part!

When to harvest: Pick strawberries when they are fully red (or their final color) and slightly soft to the touch.

How to harvest: Gently hold the berry and twist it off with its stem still attached. This keeps the fruit from bruising and keeps it fresh longer.

Quick Reference Table

Task	What to Do	Why
Variety	Choose day-neutral types like Albion or Seascape for year-round fruit.	They fruit continuously in a greenhouse.
Planting	Keep the crown above soil level.	Prevents crown rot.
Watering	Water in the morning at soil level.	Prevents fungal diseases on leaves and fruit.
Pollination	Hand-pollinate flowers daily with a soft brush.	No bees in the greenhouse.
Feeding	Use high-potash fertilizer once flowers appear.	Encourages more and better fruit.
Runners	Snip them off as they grow.	Directs energy to fruit, not new plants.

The Bottom Line

Growing strawberries in a greenhouse is one of the most rewarding things you can do. The taste of a sun-warmed berry picked fresh from your own plant is unbeatable. Start with the right day-neutral variety, keep the crown above the soil, pollinate by hand, and feed them well.

The first time I tasted a strawberry from my greenhouse, I was amazed at the sweetness. It was a moment of pure joy. You can have that too. Now, get out there and start planting!

How to Grow Strawberries in a Greenhouse