Garden Notes May 2026

Written By Webmaster PMGA

In Zones 8a and 8b, May marks the true start of summer growing conditions. Soil is fully warmed, frost danger is gone, and warm-season crops begin rapid growth. This is a month focused on planting heat-loving vegetables, maintaining steady irrigation, mulching heavily, and staying ahead of pests before peak summer pressure arrives.


ALWAYS REMEMBER:
All dates are contingent on weather. Keep a close eye on conditions and adjust as needed.

🌞 VEGETABLE GARDEN – MAY

🌱 Direct Sow (All Month)

Soil is warm enough for heat lovers:

  • Okra

  • Southern peas (black-eyed peas, crowder peas)

  • Bush & pole beans (continue succession planting)

  • Sweet corn (last plantings early May for best yield)

  • Cucumbers

  • Summer squash & zucchini

  • Winter squash

  • Pumpkins

  • Melons

  • Swiss chard (heat tolerant)

💡 Continue succession planting beans and cucumbers every 2–3 weeks through June.

🌿 Transplant

  • Sweet potato slips

  • Basil

  • Heat-tolerant herbs

  • Late tomatoes (for staggered harvest)

In hotter 8a regions, early May is ideal before intense heat sets in.

🥬 Harvest & Transition Cool Crops

  • Lettuce will bolt quickly — harvest aggressively.

  • Spinach is finishing.

  • Peas wrap up mid–late May.

  • Garlic and bulbing onions begin sizing up.

Remove declining cool crops to reduce pest buildup and free space for summer planting.

🍓 FRUIT CARE

Harvest Season Begins

  • Blueberries

  • Early blackberries

  • Strawberries (peak harvest)

Maintenance

  • Net berries before birds strip them.

  • Thin heavy fruit loads on peaches if not done.

  • Water fruit trees deeply during dry spells.

  • Refresh mulch around trees and shrubs.

Avoid heavy pruning now — focus on watering and fruit support.

🌸 FLOWERS

Direct Sow

  • Zinnias

  • Sunflowers

  • Cosmos

  • Marigolds

  • Celosia

  • Gomphrena

Plant or Maintain Heat-Loving Perennials

Strong performers for 8a–8b summers:

  • Echinacea purpurea

  • Rudbeckia hirta

  • Gaillardia pulchella

  • Monarda didyma

  • Asclepias tuberosa

Deadhead early bloomers to extend flowering and encourage rebloom.

🐝 POLLINATOR PLANTS

May is prime time to establish nectar sources:

  • Milkweed

  • Salvia

  • Pentas

  • Lavender

  • Coreopsis

  • Dill & fennel (host plants for swallowtails)

  • Borage

Allow some herbs like basil and oregano to flower for additional bee forage.

✂️ PRUNING & GARDEN TASKS

Tomatoes

  • Remove lower leaves touching soil.

  • Lightly prune for airflow.

  • Mulch deeply to prevent soil splash.

Roses

  • Deadhead spent blooms.

  • Begin regular feeding schedule.

Shrubs

  • Prune spring bloomers after flowers fade.

  • Light shaping only — avoid heavy pruning in rising heat.

🐛 PEST WATCH

Warmer temperatures increase activity:

  • Aphids

  • Squash vine borers (often late May in 8a)

  • Tomato hornworms

  • Flea beetles

  • Spider mites (in hot, dry areas)

Inspect undersides of leaves weekly and act early.

💧 WATER & MULCH

By late May, irrigation becomes essential:

  • 1–1.5 inches of water per week.

  • Water deeply 2–3 times weekly rather than lightly every day.

  • Maintain 2–3 inches of mulch to moderate soil temperature.

Morning watering reduces disease pressure.

🌡️ WEATHER CONTINGENCIES

Cool & Wet May

  • Watch for fungal disease (early blight).

  • Improve spacing and airflow.

  • Avoid overhead watering.

Hot Early Summer Conditions

  • Install shade cloth for greens and new transplants.

  • Increase watering frequency.

  • Mulch immediately after planting.

Webmaster PMGA https://pmgv.org
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Garden Notes April 2026