Borage in Zone 4A — Northeast

Borage is a fantastic addition to any Northeast garden. Its cucumber-flavored leaves and beautiful blue star-shaped flowers are edible, adding a unique touch to summer salads and drinks. Plus, it attracts pollinators, benefiting your other crops. It's a rewarding plant to grow and use.

Our short growing season here in Zone 4A can be a challenge, but Borage matures quickly, fitting nicely into our 128-day window. Even with our occasional late spring frosts or early fall chills, you’ll find Borage is quite adaptable.

While Borage prefers direct sowing, you *can* start seeds indoors a few weeks before our typical last frost. If you do, transplant outdoors in early to late May, once the soil has warmed up a bit.

Be sure to harden off your seedlings for about a week before planting them in the ground. This involves gradually exposing them to outdoor conditions. Space them about 12-18 inches apart to allow for their bushy growth habit.

Keep an eye on the weather forecast around transplant time. We can sometimes get a late frost in May, so be prepared to cover your young plants if needed.

Direct sowing is the preferred method for Borage, and it's super easy. Wait until mid May through mid July to sow your seeds directly into the garden. Borage germinates best when the soil temperature is consistently around 60-70°F.

Prepare your soil by loosening it and adding some compost. Even with our rocky New England soil, Borage is pretty forgiving. Sow seeds about ½ inch deep and 12-18 inches apart. Borage is known to self-seed readily, so be prepared to have volunteers popping up in your garden next year!

Borage needs moderate watering, which is fairly straightforward in the Northeast's climate. We usually get pretty consistent rainfall throughout the summer. However, don't rely solely on rain.

Check the soil moisture regularly. Stick your finger about 2 inches deep into the soil. If it feels dry, it's time to water. Aim for about 1 inch of water per week, either through rainfall or supplemental watering.

Water at the base of the plant rather than overhead, especially with our moderate-to-humid conditions. This helps to prevent fungal diseases. Yellowing leaves can be a sign of overwatering, while wilting indicates underwatering. A layer of mulch around the base of the plants will help retain moisture and keep the soil cool.

You can expect your first Borage harvest starting in early July and continuing through late September. Given our 55-day maturity, you'll be enjoying those cucumber-y leaves and star-shaped flowers in no time!

The best time to harvest the flowers is when they are fully open and vibrantly blue. For the leaves, pick them when they are young and tender, as they can become a bit prickly as they mature. Gently snip the flowers or leaves from the plant, being careful not to damage the main stem.

Regular harvesting encourages continued production. As our first frost approaches in mid- September, harvest any remaining flowers and leaves to enjoy before the cold weather sets in. You can even dry the flowers for later use in teas or potpourris.

Here are a few common problems you might encounter with Borage in your Northeast garden:

Self-Seeding Aggressively

• What it looks like: Numerous Borage seedlings popping up throughout your garden, even in areas where you didn't plant them.
• What causes it: Borage is a prolific self-seeder. The seeds drop to the ground and readily germinate, especially with our consistent rainfall.
• How to fix/prevent it: Deadhead the flowers before they go to seed, or be diligent about removing unwanted seedlings as they emerge. Consider growing Borage in a container to limit its spread.

Powdery Mildew

• What it looks like: White or grayish powdery coating on leaves and stems. Leaves may curl, yellow, and die.
• What causes it: Various fungi thrive in our warm days, cool nights, and moderate humidity. Dry leaf surfaces actually favor it.
• How to fix/prevent it: Improve air circulation by spacing plants properly and pruning if needed. Remove affected leaves. Neem oil or potassium bicarbonate sprays can help. A milk spray (1 part milk to 9 parts water) is also effective.

Can Become Leggy

• What it looks like: Long, weak stems with sparse foliage. The plant may flop over.
• What causes it: Insufficient sunlight. While Borage tolerates part shade, it prefers full sun.
• How to fix/prevent it: Ensure your Borage is planted in a location that receives at least 6 hours of sunlight per day. Prune back leggy stems to encourage bushier growth.

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. Good air circulation and avoiding overhead watering are key to prevention.

Borage is a great companion plant for many vegetables and herbs in the Northeast garden. It's especially beneficial near tomatoes, squash, strawberries, and cucumbers. It attracts pollinators, which can improve fruit set in these crops. Plus, it's said to deter tomato hornworms.

I don't know of any specific plants to AVOID planting near borage.