The summer garden
Stewardship, not planting.
Zone 6B · Hunterdon County, NJ
“Dry August and warm doth harvest no harm.”
- Peak heat
- Mid-July to mid-August
- Water target
- 1 inch per week
- Fall starts by
- July 15
- First frost
- October 10–20
Spring is planting; fall is math. Summer is neither. It’s stewardship — keeping alive what’s already in the ground, defending it from what’s hunting it, and knowing when to pull a done crop and start the next one. If you did the real work in May, summer is mostly showing up on the right days.
The one thing summer is about
Watering.
More summer gardens die of bad watering than of any pest, disease, or heat wave. Six rules, all worth knowing before June:
01Water deeply, once a week — 1 inch total
One deep watering (all the way through the root zone) beats three shallow ones. Shallow watering keeps roots at the surface where they cook in July heat. Deep watering pulls roots down; the plant becomes drought-resilient.
02Water early morning, never midday
Midday water evaporates before it reaches roots — and any drops on leaves in full sun can scorch. Morning watering hydrates the plant before heat hits and leaves are dry by evening (reduces fungal disease).
03Water at the soil, not overhead
Soaker hoses or drip lines under mulch put water where roots are and keep leaves dry. Overhead watering wastes half to evaporation and spreads leaf diseases (blight, powdery mildew).
04Check containers daily — twice on 90°F days
Pots dry out fast. If a container wilts, you've already lost yield — the plant recovers but stops producing for a beat. Big pots hold moisture longer; go bigger if you're gone during the day.
05Mulch 2–3 inches deep on every bed
Cuts water needs in half. Suppresses weeds. Keeps soil temperature moderate. Straw, shredded leaves, grass clippings — all work. Refresh mid-summer if it's thinning.
06Use a rain gauge; supplement only when short
A one-inch rain counts. Two half-inch rains in a week counts. Don't water on top of a wet garden — over-watering causes root rot and blossom drop.
Crops by heat tolerance
Who loves summer, who tolerates it, who quits.
The mistake is expecting every crop to make it through July. Some do; some slow down; some bolt to seed and die. Knowing which is which lets you plan the summer garden around the crops that will actually produce.
Heat-tolerant
OK up to ~85°F with steady water
Grow well through summer if you keep them mulched and watered. Yields drop above 90°F but plants don't die. Some bolt in extended heat — plant in mid-June or early July to hit their sweet spot in cooler weeks.
- Cucumbers
- Summer squash & zucchini
- Green beans (bush & pole)
- Sweet corn
- Chard
- Malabar spinach
- Basil (bolts if flowers not pinched)
- Parsley
- Rosemary, oregano, thyme
- Cherry tomatoes (peak in heat)
Heat-averse
Bolts or turns bitter above 75°F
The spring greens that hate summer. Once heat arrives, they bolt to seed and turn bitter. Pull them and plant something else. Circle back in August for a fall sowing.
- Lettuce (all types)
- Spinach
- Cilantro
- Arugula
- Radishes (become woody)
- Peas (die outright)
- Broccoli, cauliflower, cabbage (bolt)
- Bok choy
The summer pest calendar
What’s hunting the garden.
Every summer pest peaks in a specific window. Catching them in the first week they show up is a five-minute job; catching them in the third week is a two-hour job that might not save the plant. Watch the beds daily; the first ten of anything is the moment to act.
Squash vine borer
Peak: Mid-June through July
Targets: Zucchini, summer squash, winter squash, pumpkins
The adult (red-and-black moth) lays a single egg at the base of squash stems. Larva bores in and hollows out the stem, wilting the whole plant. Prevention: wrap stems in aluminum foil at ground level, or interplant tromboncino squash (resistant). Once infested, split the stem lengthwise, remove the larva, mound soil to encourage rerooting.
Japanese beetle
Peak: Late June through July
Targets: Roses, beans, basil, grapes, raspberries, cherries
Metallic green-and-copper beetles that skeletonize leaves in swarms. Hand-pick into soapy water early morning (they're slow when cold). Never use pheromone traps — they attract more beetles than they catch. Milky spore or predator nematodes applied in September attack next year's grubs.
Cucumber beetle
Peak: June through August
Targets: Cucumbers, squash, melons
Yellow-and-black striped or spotted beetles that also transmit bacterial wilt. Row cover over young plants (removed at flowering for pollination) is the most reliable defense. Trap crops of blue hubbard squash lure them away from your main crop.
Tomato hornworm
Peak: July through August
Targets: Tomatoes, peppers, eggplant
Massive green caterpillars (up to 4 inches). Fast eaters — one hornworm can strip a tomato plant's leaves in two days. Hand-pick at dusk when they're active. If you see a hornworm covered in white rice-like pods, leave it — those are parasitic wasp cocoons, and the wasps will treat your whole garden next year.
Aphids
Peak: All summer, peaks in dry heat
Targets: Everything — especially peppers, beans, brassicas
Small green, black, or white bugs clustered on new growth and leaf undersides. Blast with a hose to knock them off. Ladybugs and lacewings eat them; plant sweet alyssum and dill to attract the beneficials. Severe: spray with insecticidal soap in the evening.
Mexican bean beetle
Peak: July through August
Targets: Green beans, lima beans
Copper-colored beetles that look like large ladybugs. Yellow spiky larvae are the worse chewers. Hand-pick both stages; crush the yellow egg clusters on leaf undersides. Interplant with rosemary or savory as a deterrent.
Mosquitoes
Peak: All summer, worse after rain
Targets: You, not the plants
Empty every container of standing water at least twice a week — saucers, empty pots, wheelbarrows, tarps that hold puddles. Bti dunks (Bacillus thuringiensis israelensis) in the rain barrel kill larvae without hurting anything else.
Keeping the harvest coming
Summer succession sowing.
One big planting produces one big harvest, then nothing. Small plantings every 2–3 weeks give you a steady flow — and there’s a last-sow-by date for each crop before frost catches up.
Bush beans
Every 2 weeks · last sow: August 1
Bush beans peak in 3–4 weeks then decline. A second sowing in early July keeps the harvest going into September. Last sowing by Aug 1 to mature before frost.
Cucumbers
Every 3 weeks · last sow: July 15
First cucumbers are exhausted by August. A second sowing in late June or early July keeps you in cucumbers into September.
Summer squash & zucchini
Once mid-summer · last sow: July 15
One extra planting in early July replaces the exhausted or borer-hit first planting. Fall harvest through frost.
Carrots
Every 3 weeks · last sow: July 20
Summer sowings mature into fall and can be left under straw through December for winter storage.
Beets & chard
Every 4 weeks · last sow: August 15
Both do well in summer heat. Continued sowings give you tender greens all season and roots for fall harvest.
Cilantro & dill
Every 2 weeks · last sow: September 15
Both bolt fast in heat. Small frequent sowings give you continuous fresh leaves. Fall sowings size up under cooler nights.
Basil
Once mid-summer · last sow: July 15
First basil gets woody by August. A second sowing gives you fresh, tender leaves through frost — the best pesto basil of the year.
When and what to feed
Fertilizer timing.
Not every crop wants a mid-summer feed. Heavy feeders (tomatoes, peppers, squash, corn) need side-dressing to sustain yields. Legumes need nothing — they fix their own nitrogen. Everything else falls somewhere between. Feed based on need, not on schedule.
Tomatoes
Every 2–3 weeks from first fruit set
Side-dress with compost or diluted fish emulsion (dilute 1:5). Calcium is critical — a scoop of crushed eggshells or gypsum at transplant prevents blossom-end rot.
Peppers
Once at fruit set, again in mid-July
Light feeder compared to tomatoes. Compost or a balanced organic fertilizer. Too much nitrogen makes leaves and no peppers.
Squash (summer & winter)
Once at flowering, again 3 weeks later
Heavy feeder. Side-dress with compost and a phosphorus source (bone meal). Watch for magnesium deficiency (yellow-veined leaves) in sandy soil — a foliar spray of Epsom salt corrects it.
Cucumbers, melons
Once at flowering
Balanced organic fertilizer or compost. Consistent water matters more than fertilizer for fruit quality.
Corn
When knee-high, again at tasseling
Heavy nitrogen feeder. Blood meal, alfalfa meal, or fish emulsion. Without side-dressing, ears are stunted and kernels don't fill.
Beans & peas
Never — do not fertilize
Legumes fix their own nitrogen through root nodules. Extra nitrogen produces all vine and no pods.
Leafy greens
Once per crop cycle
Light nitrogen feed (compost tea, blood meal). Greens are nitrogen-hungry but a single dose at planting is usually enough for a spring or fall crop.
The garden’s second act
The mid-summer refresh.
Between July 15 – August 15, half the beds in the garden become available. Spring lettuce has bolted, peas are done, early beans are exhausted. That empty ground is the setup for the fall garden — and if you leave it fallow, it becomes weeds. Every bed you pull should have a plan for what goes in next.
Pull: Bolted spring lettuce, spinach, radishes
Replace with: Fall brassicas (broccoli, cabbage, kale) or a cover crop
Spring greens are done by late June. The empty bed either grows fall crops or sits under a cover crop. Empty is not a third option — weeds will take it.
Pull: Finished peas
Replace with: Bush beans, cucumbers, or winter squash
Peas leave nitrogen-rich soil behind. Perfect handoff for a nitrogen-hungry summer crop.
Pull: Exhausted early beans
Replace with: Second sowing of bush beans, or fall carrots/beets
First bean plants collapse by late July. Same bed can be resown or turned over to fall roots.
Pull: Diseased or done tomato plants
Replace with: Fall lettuce, spinach, or a cover crop
A tomato that has stopped producing is now growing disease. Pull it (do not compost if diseased), amend the soil, and plant fall greens or oats.
Pull: Overrun cucumber vines with bacterial wilt
Replace with: Fall carrots, beets, or radishes
Wilted cucumbers won't recover. Cut them out at ground level, sanitize your pruners, replant with root crops that aren't in the cucurbit family.
What to grow when the usual bolts
Heat-tolerant substitutes.
The bolted spinach doesn’t come back until fall. If you want fresh greens in July and August, there are less-familiar crops that actually love summer heat. Most of them aren’t at the grocery store — another reason to grow them yourself.
Instead of spinach, try: New Zealand spinach or Malabar spinach
New Zealand spinach is a heat-tolerant native to (surprise) New Zealand — grows all summer, tastes almost identical to spinach. Malabar is a climbing vine with red stems; more assertive flavor but productive.
Instead of lettuce, try: Amaranth greens or Egyptian spinach (molokhia)
Amaranth grows fast, tolerates 90°F+, and its leaves are similar in texture to spinach when cooked. Molokhia is a Middle Eastern staple, slightly mucilaginous when cooked, delicious in soups.
Instead of cilantro, try: Culantro (Eryngium foetidum) or Vietnamese coriander
Culantro tastes almost identical to cilantro but tolerates summer heat without bolting. Vietnamese coriander (Rau răm) has a similar herbal profile — perennial in warm climates, annual here.
Instead of broccoli / cabbage, try: Kale (mature) or collards
Both kale and collards tolerate summer heat better than their brassica cousins, especially if given afternoon shade. They'll slow but not bolt in July.
What’s next
Put it into practice.
The monthly almanac is where summer stewardship lands in real time — when to water, what pest to expect this week, what fall crop to start indoors.
Back to the almanac.