Dirt on the Strip: Summer Planting in the Upstate and Vital June Garden Tips

June has arrived in the Upstate, bringing a distinct shift in our backyard routines. While recent May downpours put a welcome dent in our severe spring moisture deficit, the intense summer heat is officially building.

Whether managing established backyard beds or looking to maximize seasonal production, this week’s guide breaks down what to plant right now and the critical preservation steps needed to keep a garden thriving through the summer humidity.

What to Plant in the Upstate Right Now

Many gardeners assume the spring planting window is completely closed by June, but the sustained summer warmth opens the perfect second window for heat-loving crops and fall preparation.

Direct-Sow Summer Staples

Now that daytime temperatures are consistently climbing into the 80s and 90s, the soil is warm enough to direct-sow seeds that thrive in intense heat. Focus on the following varieties this week:

• Okra: This is prime time to plant okra. Varieties like Clemson Spineless, Burgundy, or Jambalaya love the heat. Direct-sow seeds into a sunny patch or large containers, and remember to pick the pods when they hit about three inches long to prevent them from turning tough and woody.

• Corn & Melons: June is an excellent month for direct-sowing sweet corn, heirloom popcorn, and watermelons. Ensure they receive full sun and deep, weekly watering to establish strong root systems.

• Peppers & Eggplants: If you have late transplants or want to start a second wave of sweet or hot peppers and eggplants, get them into the ground now.

Succession Planting and Fall Prep

To lengthen the harvest season into autumn, plant a second round of summer squash, cucumbers, and cantaloupe. Additionally, June serves as the starting line for the fall garden. Start direct-sowing winter squash, pumpkins, and heat-tolerant greens like collards and mustard to give them ample time to mature before the first autumn frosts.

Three Vital June Gardening Tips

The transition into summer requires switching from growth strategies to maintenance and protection. Implement these three steps this week to safeguard your plants:

1. Maintain Steady Irrigation to Prevent Blossom End Rot

As tomatoes, peppers, eggplants, and squash develop their initial fruit, they become highly susceptible to blossom end rot—a condition that causes the bottom of the fruit to turn black and leathery.

Contrary to popular belief, this is rarely caused by a lack of calcium in Upstate soil; rather, it stems from inconsistent watering. When soil moisture fluctuates drastically, the plant cannot properly absorb calcium. Keep a steady, deep irrigation schedule to keep the soil evenly moist as fruit matures.

2. Lock in Soil Moisture with a Deep Layer of Mulch

With the summer sun evaporating surface moisture rapidly, bare soil is a liability. Apply a clean 2-to-3-inch layer of mulch—such as straw, shredded leaves, or wood chips—around vegetable beds and fruit plantings. Mulching serves a triple purpose: it keeps plant roots cool, drastically reduces the frequency of necessary watering, and smothers aggressive summer weeds before they can steal nutrients.

3. Apply the ‘Chelsea Chop’ to Tall Native Perennials

If you are growing late-blooming native perennials like goldenrod, asters, coneflowers, or Joe Pye weed, they may be looking tall and a bit leggy. June offers a final opportunity to perform a maintenance trim known as the “Chelsea chop.”

Cut the stems back by one-third to one-half. This temporary haircut delays flowering slightly but forces the plant to grow sturdier, bushier, and much less likely to flop over under the weight of late-summer blooms.