Potato in Zone 8B — Southeast

Growing your own potatoes in our Zone 8B Southeast climate gives you access to varieties you'll never find in stores, from buttery fingerlings to colorful purple spuds that taste nothing like the bland supermarket options. Our long growing season means you can plant early varieties in late winter and still have time for a second planting in summer, giving you fresh potatoes from late spring through late fall. The satisfaction of digging up a hill of perfect potatoes is hard to beat, and they store beautifully in our region's cooler winter months.

While our hot, humid summers and clay soil can challenge potato growing, proper timing makes all the difference. Our 255-day growing season gives you plenty of flexibility to work around the summer heat, and those reliable afternoon thunderstorms help keep your crop watered. Plant early for a spring harvest, or wait until summer for fall potatoes when the weather cools down.

Transplanting potato plants isn't the typical approach since potatoes are grown from seed potatoes (tuber pieces) rather than seedlings. However, if you've started potato slips or green shoots indoors from seed potatoes, you can transplant them outdoors from late February through mid-March in our Southeast region.

Before moving any potato starts outside, harden them off gradually over a week by placing them in a sheltered spot for a few hours daily, gradually increasing their outdoor time. Space transplanted potato starts 12 inches apart in rows, burying the stems deep enough to cover the roots completely.

Watch the weather closely during transplant time, as our late winter can bring unexpected cold snaps even after warm spells. Be ready to cover young plants if temperatures drop below freezing, which can still happen through early March in our area.

Direct sowing seed potatoes is the recommended and most common method for growing potatoes in our Southeast region. Plant your seed potato pieces from late February through early August, giving you multiple planting opportunities throughout our long growing season. For spring planting, wait until soil temperature reaches at least 45°F and you can work your clay soil without it sticking to your tools.

Prepare your planting area by loosening clay soil and adding compost to improve drainage, which is crucial for preventing rot in our humid climate. Cut seed potatoes into pieces with at least two eyes each, let them cure for a day or two until the cut surfaces dry, then plant them 4 inches deep and 12 inches apart. In clay soil, consider planting in raised rows or mounds to improve drainage.

Summer plantings work well from mid-July through early August for a fall harvest. The key is timing your planting so tubers form during cooler weather while avoiding the intense heat of mid-summer, which can stress plants and reduce yields.

Potatoes need consistent moisture but hate waterlogged conditions, making watering management critical in our wet-summer Southeast climate. During our typical 45-55 inches of annual rainfall, you'll often find that nature handles most of the work, but you'll need to supplement during dry spells and monitor carefully during heavy rain periods.

The most crucial watering period is during tuber formation, which happens when plants begin flowering. During this stage, maintain about 1-2 inches of water per week, including rainfall. Use the finger test by pushing 2 inches deep into the soil – if it's dry at that depth, it's time to water. Our clay soil tends to stay moist longer than sandy soils, so check carefully before adding more water.

Water at the base of plants rather than overhead to reduce disease pressure in our humid conditions. Overhead watering combined with our natural humidity creates perfect conditions for late blight and other fungal problems. During those afternoon thunderstorms, check for standing water around plants and consider improving drainage if needed.

About two weeks before harvest, reduce watering significantly to help potato skins toughen up for storage. Wet soil at harvest time leads to rot and poor storage quality. A 2-3 inch layer of straw mulch helps regulate soil moisture and keeps tubers from greening, while also helping suppress weeds during our long, hot summers.

Your first potato harvest typically arrives in late May through June if you planted in late winter, with the harvest window extending through late November for summer plantings. With a 90-day maturity period, timing your harvest depends on whether you want new potatoes or mature storage potatoes.

For tender new potatoes, start harvesting when plants begin flowering, carefully digging around the base to find marble-sized tubers while leaving the plant intact to continue producing. For full-sized storage potatoes, wait until the foliage completely dies back naturally, then let them sit in the ground for another week to allow skins to toughen up.

Harvest on a dry day when possible, digging carefully with a fork to avoid puncturing tubers. Our clay soil can make digging challenging, but it also protects potatoes well once you reach them. Brush off excess soil but don't wash potatoes intended for storage – let them cure in a cool, dark, well-ventilated place for about 10 days before storing.

As our first frost approaches in mid-November, make sure to harvest any remaining potatoes. Even though potato foliage can handle light frosts, hard freezes will damage tubers left in the ground. Late-season harvests often provide excellent storage potatoes that will keep you supplied through winter.

Colorado Potato Beetle These distinctive yellow and black striped beetles and their orange larvae can defoliate potato plants quickly. Adult beetles emerge in late spring, and you'll see them feeding on leaves along with clusters of yellow eggs on leaf undersides. In our area, they typically show up just as plants are getting established and can have multiple generations per season.

Colorado potato beetles develop resistance to pesticides easily, so hand-picking remains one of the most effective controls. Check plants daily during peak season and crush egg masses while removing adult beetles. Row covers work well for young plants, and beneficial insects like ladybugs help control larvae naturally.

Late Blight Late blight appears as large, dark green-gray water-soaked spots on leaves, often with white fuzzy growth on leaf undersides during our humid conditions. This devastating disease can destroy entire plantings within days, especially during cool, wet periods in spring or fall when conditions favor rapid spread.

Late blight thrives in our humid climate, particularly during extended periods of high moisture. Remove and destroy affected plants immediately – bag them rather than composting. Apply copper-based fungicides preventatively if conditions favor disease development, ensure good air circulation between plants, and avoid overhead watering that keeps foliage wet.

Scab Potato scab causes rough, corky patches on tuber surfaces, making potatoes unsightly though still edible after peeling. This bacterial disease is more severe in alkaline soils and becomes worse during dry conditions followed by heavy watering – exactly what can happen during our variable summer weather patterns.

Prevent scab by maintaining slightly acidic soil (pH 5.2-6.0) and avoiding fresh manure applications. Keep soil moisture consistent rather than allowing it to dry out completely then flooding it during heavy rains. Plant resistant varieties when possible, and avoid over-liming your soil.

Southeast Specific Challenges Our combination of hot, humid summers with heavy rainfall creates perfect conditions for fungal diseases while clay soil can lead to waterlogged conditions that promote rot. Japanese beetles may also feed on potato foliage during their peak season in mid-summer, and deer will dig up freshly planted seed potatoes if your garden isn't protected.

Plant potatoes alongside beans, which fix nitrogen in the soil and benefit the heavy-feeding potato plants, and corn, which provides light shade during our intense summer sun without competing heavily for nutrients. Brassicas like cabbage and broccoli make excellent companions since they mature at different times and don't compete for the same soil nutrients, plus their strong scents may help deter some potato pests.

Avoid planting potatoes near tomatoes, peppers, or eggplants since they're all in the nightshade family and share common diseases like late blight, which can devastate your entire crop during our humid conditions. Skip squash, cucumbers, and sunflowers as companions since they're heavy feeders that compete directly with potatoes for nutrients and space, and sunflowers can inhibit potato growth through allelopathic effects.