Garden row covers are a simple yet powerful tool for extending your growing season, protecting plants from frost, and keeping pests at bay. Whether you're a beginner or a seasoned gardener, understanding how to select and use the right row cover can make a big difference in your harvest. This guide covers everything from types and weights to installation and common pitfalls.
What Are Garden Row Covers and Why Use Them?
Garden row covers, also known as floating row covers or garden fabric, are lightweight materials placed directly over plants or supported by hoops. They act as a barrier against cold temperatures, insects, and even heavy rain. The main benefits include frost protection (typically 2-8°F of warmth), pest exclusion (e.g., cabbage worms, aphids), and faster growth due to a mini-greenhouse effect. They're reusable, affordable, and easy to install.
How to Choose the Right Row Cover: Weight and Material
Row covers come in different weights, measured in ounces per square yard (oz/yd²). Here's a breakdown:
- Lightweight (0.5-1.0 oz/yd²): Best for pest control and light frost (down to 28°F). Allows 85-95% light transmission. Use for summer veggies like lettuce, carrots, and brassicas.
- Medium weight (1.5-2.0 oz/yd²): Offers frost protection down to 24°F and some pest control. Light transmission around 70-80%. Good for spring and fall crops like tomatoes, peppers, and melons.
- Heavyweight (2.5-4.0 oz/yd²): Protects down to 20°F or lower, but reduces light to 50-60%. Best for extreme cold or overwintering crops like kale and spinach.
Material is typically spunbond polypropylene or polyester. Choose breathable fabric to avoid heat buildup and moisture issues. Avoid plastic sheets unless you have a ventilated hoop house.
Step-by-Step Installation Guide
Follow these steps for effective use:
- Prepare the bed: Remove weeds and debris. Water plants well before covering.
- Choose support: For lightweight covers, you can drape directly over plants (if they are sturdy) or use hoops (PVC, wire, or metal) to prevent fabric from touching leaves. For heavy covers, hoops are essential to avoid crushing plants.
- Secure the edges: Bury the edges in soil, use landscape staples, or weigh down with bricks/stones. Ensure no gaps for pests to enter.
- Monitor temperature: On sunny days, lift or vent the cover to prevent overheating (over 85°F can damage plants). Remove during pollination if bees are needed (e.g., squash, cucumbers).
- Remove when needed: Take off covers after frost danger passes or when plants outgrow the space. Reuse next season.
Common Mistakes and How to Avoid Them
Here are pitfalls many gardeners face:
- Not securing edges: Wind can lift covers, exposing plants. Always anchor well.
- Using wrong weight for season: Heavy covers in summer can cook plants; light covers in winter may not provide enough frost protection.
- Leaving on during pollination: Crops like tomatoes and squash need wind or insects. Remove covers when flowers appear or hand-pollinate.
- Ignoring moisture: Condensation can lead to mold. Use breathable fabric and lift on warm days.
- Buying cheap, non-breathable plastic: This traps heat and humidity, harming plants. Invest in quality spunbond fabric.
FAQ About Garden Row Covers
Q: Can I use row covers for summer vegetables?
A: Yes, lightweight covers are great for pest control on crops like broccoli, cabbage, and carrots. Remove when temperatures exceed 85°F.
Q: How much frost protection do they provide?
A: Typically 2-8°F of warmth. Check product specs. Combine with mulch for extra insulation.
Q: Do I need to remove covers for watering?
A: If using breathable fabric, water can penetrate. Otherwise, remove or use drip irrigation under the cover.
Q: How long do row covers last?
A: With proper care, 2-5 seasons. Store in a cool, dry place away from rodents.
Final Tips for Success
Start with a medium-weight row cover (1.5 oz) for versatility. Buy a roll or pre-cut sizes from garden centers or online. Always check the forecast and be ready to cover plants when frost is expected. With row covers, you can harvest earlier in spring and later into fall, maximizing your garden's potential.