Borage in Zone 6A — Southeast

Borage is a fantastic addition to any Southeast garden. Its striking blue flowers are not only beautiful but also attract pollinators, which is always a win. Plus, the young leaves offer a unique cucumber-like flavor that's refreshing in our long summer salads.

While our hot and humid summers can present challenges with disease pressure, Borage thrives with proper spacing and air circulation. With our long 198-day growing season, you'll have plenty of time to enjoy this versatile herb.

You can transplant Borage seedlings outdoors from late March through late April. Before planting, be sure to harden them off by gradually exposing them to outdoor conditions for about a week. This helps them adjust to our fluctuating spring temperatures.

Space your Borage plants 12-18 inches apart to allow for good air circulation. This is especially important in our humid climate to prevent fungal diseases. Keep an eye on the weather forecast – those late-season cold snaps can still happen, so protect young transplants if needed.

Direct sowing Borage is the easiest and most common method, and it works great in the Southeast. Sow seeds from early April through mid August, once the soil has warmed up a bit. Borage is pretty forgiving.

Prepare your soil by loosening it and removing any rocks or debris. Sow seeds about ½ inch deep and 12-18 inches apart. You can always thin them later if needed. Borage self-seeds readily, so be prepared for volunteers popping up in your garden!

Borage needs moderate watering, especially during our hot and humid summers. While it's fairly easy-going, it's not drought-tolerant, so consistent moisture is key. Remember, we tend to get regular afternoon thunderstorms, which can help.

Check the soil moisture by sticking your finger about 2 inches deep. If it feels dry, it's time to water. Aim for about 1 inch of water per week, either from rainfall or irrigation. Water at the base of the plant to avoid wetting the leaves, which can encourage fungal diseases in our humid climate.

Wilting leaves indicate underwatering, while yellowing leaves can signal overwatering. Applying a layer of mulch, like pine straw or shredded bark, around your Borage plants helps retain moisture and suppress weeds, which is especially helpful with our clay soil.

You can expect your first Borage harvest starting in early June and continuing through early November. The star-shaped blue flowers are ready to harvest when they are fully open. The young leaves are best when they are small and tender.

To harvest, simply snip off the flowers or leaves with scissors or your fingers. Be gentle to avoid damaging the plant. Regular harvesting encourages continued production throughout the long summer.

As our first frost approaches in late October, you can harvest any remaining flowers and leaves. You can also let some of the plants go to seed if you want volunteers next year.

Here are the most common problems you might encounter with Borage in the Southeast:

Self-seeding aggressively

• What it looks like: Borage seedlings popping up everywhere in your garden, even where you didn't plant them.
• What causes it: Borage is a prolific self-seeder, and the seeds can remain viable in the soil for a long time. Our mild winters often don't kill off the seedlings.
• How to fix/prevent it: Deadhead the 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. Leaves curl, yellow, and die.
• What causes it: Fungi thrive in warm days, cool nights, and moderate humidity – all common in the Southeast. Dry leaf surfaces actually favor it.
• 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) can be effective.

Can become leggy

• What it looks like: Tall, spindly plants with few leaves, often flopping over.
• What causes it: Insufficient sunlight or overcrowding.
• How to fix/prevent it: Ensure your Borage plants receive at least 6 hours of sunlight per day. Space them adequately to allow for proper growth. Pruning can also help to encourage bushier growth.

Southeast Specific Challenges: The combination of hot heat, humid humidity, and wet-summer rainfall in the Southeast can create ideal conditions for fungal diseases like powdery mildew. Good air circulation and proper watering techniques are essential for keeping your Borage healthy. Japanese beetles can also be a nuisance, so be prepared to handpick them off your plants or use insecticidal soap if necessary.

Borage makes a great companion plant in the Southeast garden. It's particularly beneficial for tomatoes because it attracts beneficial insects that can help control pests like hornworms. It also does well with squash, strawberry, and cucumber, as it attracts pollinators that improve fruit set. Avoid planting Borage near fennel, as they can inhibit each other's growth.