Planting by the Moon, August 2026 - A Bundaberg Gardener's Guide

Your complete lunar planting calendar for the month Bundaberg pivots from winter into spring, with timing for tomatoes, beans, the last brassicas of the season, and the start of summer planning.

August is the month Bundaberg gardens turn the corner. The mornings still bite, but by the second week the soil thermometer starts climbing past 16°C, the days stretch out toward 11 and a half hours of daylight, and the dry season begins giving way to the warming westerlies that signal spring. By the end of the month, you can plant your first tomatoes for the year, and the whole calendar tilts forward.

For lunar gardeners, August 2026 is a clean four-phase month. The new moon on Thursday 13th August at 3.36 am sets up the prime leafy planting window. The first quarter on Thursday 20th August launches the fruiting wave that runs into September and October. The full moon on Friday 28th August closes the month with a harvest and bed-preparation focus.

It is also the month BOGI members traditionally start sharing seedlings at meetings and field days. If you have raised tomato or capsicum punnets indoors through July, August is when they go out. If you have not, this is the month to buy or trade strong seedlings from a trusted source.

Why Plant by the Moon

Lunar gardening is the practice of timing seed sowing, transplanting, and bed maintenance to the four phases of the moon. Traditional growers across every farming culture noticed that the same gravitational forces driving ocean tides also influence soil moisture and sap flow inside plants, and that lunar light affects germination and shoot growth. The waxing moon, from new to full, suits crops grown for above-ground harvest. The waning moon, from full to new, suits root crops, harvest, and maintenance.

The science is mixed on how strong these effects are at the scale of a backyard vegetable bed, but the practice has guided productive growers for centuries. What it offers a modern gardener is a structure. In August, with the spring planting rush starting, having a calendar that says "transplant tomatoes after 20 August" is a useful way to pace yourself.

August 2026 Moon Phases for Bundaberg

All times are local Brisbane time (AEST), which applies to Bundaberg.

Last Quarter on Thursday 6 August at 12.21 pm.

New Moon on Thursday 13 August at 3.36 am.

First Quarter on Thursday 20 August at 12.46 pm.

Full Moon on Friday 28 August at 2.18 pm.

The month opens in a waning phase carrying through from the late July full moon, which means the first week is naturally suited to root crops and bed preparation rather than fresh top growth.

1 to 5 August - Waning Gibbous, Roots and Storage

The first five days of August sit in the waning gibbous, with energy moving downward into the root zone. Cool soil temperatures still favour root crops over warm-season fruiting crops.

What to plant in this window:  

• Beetroot. Detroit Dark Red, Bull's Blood, Chioggia. Direct sow only. August plantings will pull through into late spring. 
• Carrots. Manchester Table, Topweight, Nantes. The cool soil produces dense, sweet roots. Cover newly sown rows with hessian until the seedlings emerge 
• Radish. Three weeks from sowing to plate. 
• Salad onions and shallots. Continuous succession. 
• Potatoes (last reliable window). If you missed July, get certified seed potatoes in by 5 August. Sebago, Coliban, Dutch Cream, Kipfler. Plant 10 cm deep and hill up as the haulm grows. 
• Garlic. The very last possible window, and only for warm-soil sites. The risk is single-round bulbs rather than fully segmented heads. Realistically, save your cloves for May next year.

Bundy tip. Late winter is when sweet potato slips become available again at garden centres and from BOGI swap meets. If you saw slips in July, hold them in damp sand or potted in a sheltered spot. Resist the urge to plant out before late August because soil below 18°C will rot the slips faster than they can root.

6 to 12 August - Last Quarter to New Moon, the Maintenance Week

The waning crescent is the lowest fertility window of the lunar cycle, but in August it doubles as the most important bed-preparation week of the year. Everything you do this week determines how strong your spring crops establish.

What to do in this window:

• Bed preparation. Fork over fallow beds, work in 5 to 10 cm of finished compost, add aged manure if  you have it, and a sprinkle of dolomite or gypsum if pH testing showed acidity.
• Mulch. Pull old mulch back, sow a green manure if you want to rest a bed for six weeks, or top up with fresh sugar cane or lucerne ahead of August transplanting.
• Citrus. Mandarins are winding down, oranges are at peak. Pick, juice, and freeze the surplus. Apply a complete organic fertiliser around the drip line and water it in.
• Pest patrol. Aphids on brassicas, cabbage white butterflies returning, and the first whitefly appearances on tomato and capsicum seedlings indoors. Check daily.
• Pruning. Last call for deciduous fruit pruning before bud break. Avocado, mango, and lychee can now be tip pruned to encourage spring flush.
• Compost turning. Heaps that worked through winter are ready to use. Sift the finished compost onto your spring beds.

Bundy tip. The week before a major planting wave is the right time to harden off seedlings raised indoors. Take your tomato, capsicum, and chilli punnets outside for two hours on day one, four on day two, building up to a full day by the end of the week. Skip this step and your transplants will sulk for ten days or get scorched by the August sun on day one.

13 to 19 August - New Moon to First Quarter, the Leafy Window

The new moon on 13 August launches the next waxing cycle. As lunar light returns and energy rises through plants, this is the prime window for leafy greens, the last brassicas of the year, and the first of the spring herbs.

What to plant in this window:

• Brassicas (last reliable window). Broccoli, cauliflower, cabbage, kale, kohlrabi, Asian greens. August plantings will mature through October before the first heat hits.
• Lettuce. Cool-season varieties still hold, but switch to heat-tolerant types for plantings after 20 August. Cos, butterhead, Salinas, mignonette, and the loose-leaf mixes.
• Silverbeet, spinach, and chard. Last winter sowing window before bolting risk increases.
• Asian greens. Pak choy, bok choy, tatsoi, mizuna, mustards, rocket.
• Coriander, parsley, dill, chervil, and chives.
• Spring herb seedlings. Basil from late August in warm beds, oregano, sage, thyme, marjoram, mint (in a pot), lemon balm, lemongrass.
• Nasturtiums and marigolds. Both tolerate the spring transition and earn their keep as companion plants.
• Sweet peas. Final transplanting window for spring colour.

Bundy tip. The cool ground temperatures in the first half of August can stall lettuce germination if you direct sow. For a faster, more reliable crop, sow into seedling trays kept on a warm windowsill or porch, and transplant after a week of hardening off. Direct sowing works fine from 20 August onward as the soil warms.

20 to 27 August - First Quarter to Full Moon, the Spring Fruiting Window

The waxing moon between the first quarter and the full moon is the traditional window for crops that bear fruit, pods, or seed. In Bundaberg, the first quarter of August is the moment the calendar tilts forward into spring planting. By 20 August the soil has typically reached 18°C in raised beds, which is the floor for reliable bean germination and a reasonable transplant temperature for tomatoes, capsicum, and chilli.

What to plant in this window:

• Tomatoes (transplant). Move strong seedlings into prepared beds. Choose disease-resistant varieties for our climate. Tommy Toe, Mighty Red, Black Cherry, Tigerella, Roma, San Marzano, and Grosse Lisse are all reliable in Bundaberg conditions. Stake or cage at planting. Apply mulch immediately. The BOGI shop is a reliable local source for tomato seedlings and seed through August and September.
• Capsicum and chilli (transplant). Both want warm soil. Wait until late August in cooler beds. California Wonder, Yolo Wonder, Sweet Banana, Cayenne, Habanero, Birds Eye, and Jalapeno all crop reliably here.
• Eggplant (transplant). Black Beauty and Lebanese are dependable.
• Beans, climbing and bush. Lazy Housewife, Purple King, Blue Lake, Rattlesnake. Direct sow only. Pre-soak seed for an hour for faster germination.
• Cucumbers. Lebanese, Marketmore, Sweet Slice. Direct sow into warm soil from late August.
• Zucchini and squash. Black Jack, Cocozelle, Yellow Crookneck. Direct sow late August.
• Sweet corn. Honey Sweet, Snow Gold. Direct sow late August in blocks of at least 16 plants for proper pollination.
• Sweet potato slips (final transplant window). Plant into warm, well-drained, mulched beds. Hawaiian Gold, Beauregard, Northern Star.
• Pumpkins, watermelon, rockmelon, and pumpkin (late month only). Direct sow into hills enriched with compost.
• Strawberries. Final transplanting window. Albion, Camarosa, Sweetheart.

Bundy tip. August soil can swing 10 degrees between morning and afternoon. Buy a $20 soil thermometer and check it at 9 am before you plant. If raised bed soil reads below 18°C, hold off on tomatoes for another five days. Planting too early costs you a fortnight of stalled growth and risks an early aphid hit while the seedling is too weak to outgrow the damage.

Full Moon, Friday 28 August - Harvest and Plan

The full moon at the end of August is a textbook full moon, with no special characteristics. Use the day to harvest crops you intend to store, finalise spring bed preparation, and walk the garden to assess what is working ahead of September's heavy planting wave. Traditional lunar wisdom says to avoid major above-ground sowing on the day of the full moon. Trust the schedule and treat 28 August as a planning and harvest day.

Working With Bundaberg's August Climate

August is the pivot from winter to spring in Bundaberg, with notable variation between the start and end of the month.

Daytime maximums average 23°C in the first week, climbing to 25°C by the final week.

Overnight minimums average 11 to 13°C in town, with cooler readings of 8 to 10°C out toward Childers, Gin Gin, and the Sharon district.

Rainfall averages around 30 mm for the month, the second driest of the year after July.

Humidity holds around 55 per cent.

Daylight grows from 10 hours 51 minutes at the start of the month to 11 hours 30 minutes by 31 August.

Frost in central Bundaberg is essentially over for the season by mid-August. Elevated properties around Childers can still record a light frost on clear, still nights in the first week, but the risk fades fast.

Soil temperature in raised beds rises from around 16°C at the start of the month to 19 to 20°C by the final week. This is the key metric to watch. Use a soil thermometer at 9 am to confirm before you plant warm-season crops.

What to Harvest in August

August is one of Bundaberg's most varied harvest months, with the last of winter and the first of spring overlapping.

Late mandarins, peak navel and valencia oranges, lemons, limes, grapefruit, cumquats, broccoli, cauliflower, cabbage, kale, kohlrabi, pak choy, bok choy, lettuce, silverbeet, spinach, peas, broad beans, salad onions, shallots, beetroot, carrots, radish, parsnip, herbs, the last of any winter strawberries, and asparagus spears from established crowns.

If you planted asparagus crowns in May or June, do not harvest the spears yet. Wait until the third spring after planting for a full harvest. Harvesting too early weakens the crown for years.

A Note on Lunar Gardening

Planting by the moon is older than recorded agriculture. Every traditional farming culture, from Roman to Maori to Aboriginal Australian, observed lunar cycles in their planting calendars. The mechanism, gravitational pull moving water and lunar light influencing germination, has measurable effects but small magnitudes. Soil quality, variety choice, and irrigation will always matter more.

What lunar gardening offers is a rhythm. In August, when there is suddenly too much to do and not enough weekends, having a calendar that says "transplant tomatoes between 20 and 27 August" stops you planting too early or too late. That alone is worth the practice.

Quick Reference, August 2026

• 1 to 5 August (waning gibbous). Plant root crops, last potatoes, last garlic. Bed preparation.
• 6 to 12 August (last quarter to new moon). Maintenance week. Bed prep, citrus harvest, harden off seedlings, prune deciduous fruit.
• 13 to 19 August (new moon to first quarter). Plant brassicas (last call), leafy greens, herbs, sweet peas.
• 20 to 27 August (first quarter to full moon). Plant tomatoes, capsicum, chilli, beans, cucurbits, sweet corn, sweet potato slips, The big spring wave.
• 28 August (full moon). Harvest, plan, finalise bed prep.

Looking Ahead to September

September is when Bundaberg's spring planting hits full stride. The new moon falls on Friday, 11 September and the full moon on Sunday, 27 September. Soil temperatures climb past 20°C, the spring equinox arrives on 22 September, and the full warm-season planting list opens up.

Order seed for any crops you plan to direct sow in September. Plan succession plantings for tomatoes, beans, and corn, because a single planting will not carry you through summer. Our September planting guide will be live by 1 September.

Frequently Asked Questions

When should I plant tomatoes in Bundaberg?

The textbook window for transplanting tomatoes in Bundaberg opens around 20 August and runs through to mid-October. Late August plantings give you the longest fruiting season. Wait until raised bed soil temperature reaches 18°C before transplanting, and stake or cage at planting time.

What can I plant in Bundaberg in August?

The list pivots through the month. The first half of August is still winter, suited to brassicas, leafy greens, root crops, and the last potatoes. From 20 August onward, the spring wave opens with tomatoes, capsicum, chilli, beans, sweet corn, cucurbits, and sweet potato slips.

Is it too late to plant brassicas in August?

Mid-August is the last reliable window for broccoli, cauliflower, cabbage, and kale in Bundaberg. Plantings after 20 August risk hitting October heat before they fully head. Asian greens, pak choy, bok choy, and rocket can still go in through late August because they crop quickly.

How do I know when my soil is warm enough for tomatoes?

Buy a $20 soil thermometer and measure the soil at 9 am, around 10 cm below the surface in your tomato bed. Plant when the reading hits 18°C and is rising. Below that temperature, the seedling will sulk for a fortnight, which costs you fruit and exposes the plant to early pest damage.

Where do you source the moon phase data?

All times are local Brisbane time (AEST), sourced from timeanddate.com, which is the closest reference city for Bundaberg.

Bundaberg Organic Gardeners Inc has been growing organic food in the Wide Bay since 1991. If you found this guide useful, join us to get monthly meetings, members-only resources, and access to our seed bank, and browse our shop for seasonal seeds, mulch, and member resources. Our next workshop and field day dates are on the activities and events page.

Moon phase data sourced from timeanddate.com for Brisbane, Queensland (the nearest reference city to Bundaberg).