Borage in Zone 6B — Northeast

Borage is a fantastic addition to any Northeast garden. Its unique cucumber-like flavor makes it a refreshing addition to salads and drinks, and the beautiful blue flowers attract pollinators to your vegetable patch. Plus, there's a real satisfaction in growing something a little different that thrives in our cool nights.

Our short growing season here in Zone 6B can seem daunting, especially with the risk of late spring and early fall frosts. But with a little planning, you can absolutely make the most of summer and enjoy a bountiful harvest from your borage within our 183-day growing season.

If you want a head start, you can transplant borage outdoors in early to late April. Before planting, be sure to harden off your seedlings by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the temperature swings and stronger sunlight.

Space your borage plants 12-18 inches apart to give them room to grow. Keep an eye on the weather forecast – a late frost can still nip young plants, so be ready to cover them if necessary. It's always better to be safe than sorry when dealing with our unpredictable spring weather.

Direct sowing is the preferred and easiest method for borage. Wait until mid April through early August, when the soil has warmed up a bit. Borage isn't too fussy, but it helps to loosen the soil and remove any rocks before planting. Aim for a soil temperature of at least 60°F for best germination.

Sow seeds about ½ inch deep and 12-18 inches apart. Keep the soil consistently moist until the seedlings emerge, which should take about a week or two. Borage is easy to direct sow and is known to self-seed readily, so be prepared for volunteers in the following years!

Borage needs moderate watering, especially during our peak summer months. Aim to provide about 1 inch of water per week, either through rainfall or irrigation. Our even rainfall distribution usually helps, but be sure to check the soil moisture regularly.

The finger test is a great way to gauge watering needs: stick your finger about 2 inches deep into the soil. If it feels dry, it's time to water. In our moderate-to-humid climate, it's best to water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases.

Signs of underwatering include wilting leaves and stunted growth. Overwatering can lead to yellowing leaves and root rot. A simple layer of mulch, like straw or wood chips, can help retain moisture and regulate soil temperature – a real benefit during our brief but productive summers.

You can expect your first borage harvest from early June through late October, about 55 days after planting. The star-shaped blue flowers are ready to harvest when they are fully open. The young leaves are also edible and have a refreshing cucumber flavor.

To harvest, simply snip off the flowers or leaves with scissors or your fingers. Regular harvesting encourages continued production, so don't be shy! As the first frost approaches around mid- October, harvest any remaining flowers and leaves. You can dry the flowers for later use or let some plants go to seed to ensure a supply for the next year.

Here are some common problems you might encounter with borage in the Northeast:

Self-Seeding Aggressively

• What it looks like: Numerous borage seedlings popping up throughout your garden in unexpected places.
• What causes it: Borage is a prolific self-seeder, and the seeds can remain viable in the soil for several years.
• How to fix/prevent it: Deadhead flowers before they go to seed, or pull up unwanted seedlings as they appear. Consider growing borage in containers to limit its spread.

Powdery Mildew

• What it looks like: White or grayish powdery coating on leaves, stems, and sometimes fruit. Leaves curl, yellow, and die. Reduces plant vigor.
• What causes it: Various fungi that thrive in warm days, cool nights, and moderate humidity. Dry leaf surfaces actually favor it (unlike most fungi).
• How to fix/prevent it: Improve air circulation through spacing and pruning. Remove affected leaves. Neem oil or potassium bicarbonate sprays help. Milk spray (1 part milk to 9 parts water) is surprisingly effective.

Can Become Leggy

• What it looks like: Tall, spindly plants with fewer leaves and flowers, often leaning or falling over.
• What causes it: Insufficient sunlight or overcrowding.
• How to fix/prevent it: Ensure borage receives at least 6 hours of direct sunlight per day. Thin out plants to provide adequate spacing and support them with stakes if necessary.

Northeast Specific Challenges: Our moderate heat, moderate-to-humid humidity, and even rainfall generally favor borage. However, the humidity can increase the risk of powdery mildew, so good air circulation is key. Also, our rocky New England soil can sometimes hinder root development, so amending the soil with compost can help.

Borage makes a great companion plant for several vegetables in your Northeast garden. It's known to attract pollinators, which can benefit tomatoes, squash, and cucumbers. Growing it near strawberries is said to improve their flavor and yield.

Avoid planting borage near fennel, as they can inhibit each other's growth. By choosing the right companions, you can create a thriving and productive garden that takes full advantage of our short growing season.