Honeydew is the smooth-skinned, pale green melon that ripens a little later and a little sweeter than cantaloupe — and it is the fussiest of the three melons about heat. It needs a long, hot, dry season to ripen well, which Zone 12 can provide, as long as you sow at the right time and keep the vines dry and well fed.
Like every crop in the tropics, honeydew melon rewards gardeners who work with Zone 12's seasons — the cooler, drier months and the hot, wet months — rather than against them. The planting calendar hub gives the Zone 12 picture month by month, and our guide to when to plant honeydew melon in Zone 11 shows how the timing shifts in a cooler zone.
Zone 12 at a glance
USDA Zone 12 covers the warmest, most tropical parts of the United States — Hawaii, Puerto Rico, Guam and the U.S. Virgin Islands. Winters are warm, with average winter lows of 50 to 60°F, and the growing season never really ends.
Zone 12 is frost-free year-round: there is no average last spring frost and no average first autumn frost. That means you plant by heat and by the wet and dry seasons, not by frost dates. These are USDA zone averages, not exact figures for any one garden — always check your local extension service and the forecast before planting.
| Detail | Zone 12 guidance |
|---|---|
| Average winter low | 50 to 60°F |
| Average last spring frost | Frost-free (no frost dates) |
| Average first autumn frost | Frost-free (no frost dates) |
| Days to germination | 7–10 days |
| Days to maturity | 80–100 days |
| Sowing | start indoors or direct sow |
| Sun | full sun |
| Soil pH | 6.0–7.0 |
| Spacing | 36–48 inches |
| Water needs | moderate |
| Cold tolerance | tender |
When to plant honeydew melon in Zone 12
Plant honeydew melon in Zone 12 at the start of the dry season, when the soil is warm and the coming months are sunny and relatively dry. Because Zone 12 is frost-free, with winter lows of 50 to 60°F, there is no frost date to wait for — plant by the seasons instead, sowing so that fruit ripens in dry weather. Seed germinates in 7–10 days and fruit is ready in 80–100 days, a little longer than watermelon or cantaloupe. Check your local extension service for the best local planting window. See the Zone 12 February planting guide for what else to plant that month.
Starting honeydew melon in Zone 12
Start honeydew indoors in pots or direct sow it where it is to grow — it dislikes root disturbance, so direct sowing is often best in warm soil. Sow seed an inch deep in warm, moist soil, and thin to one plant per spot, spacing plants 36–48 inches apart. Honeydew vines sprawl several feet, so give them a whole bed or a sunny corner. Warm soil is essential: seed sown in cool, wet soil rots instead of germinating.
Soil, spacing, sun and water
Honeydew needs full sun and rich, well-drained soil with a pH of 6.0–7.0. It is a heavy feeder, so dig in plenty of compost before planting and feed through the season. Water needs are moderate — keep the soil evenly moist while vines grow and fruit swells, watering at the base to keep leaves dry, then ease off as fruit ripens, since dry weather concentrates the sugars. Mulch thickly to hold moisture and keep fruit off damp soil. The watering schedule generator can help you plan watering through the season.
Companion planting
Good companions for honeydew melon include borage, marigolds, clover and chives. Borage attracts the bees that pollinate the flowers — without bees, you get no melons — and marigolds deter soil pests. Grow honeydew with other warm-season crops, and keep it away from plants that need shade, since its sprawling vines will cover them. The companion planting finder can suggest combinations for your whole bed.
Pests and problems
The common pests to watch for with honeydew melon are cucumber beetles, squash bugs, aphids and powdery mildew. Cucumber beetles chew leaves and spread wilt; hand-pick them or use row cover until flowering. Squash bugs hide under leaves and suck the sap — check leaf undersides regularly. Aphids cluster on young growth; wash them off with water. Powdery mildew coats leaves white in humid weather; improve air flow, avoid wetting leaves, and remove affected leaves promptly.
Harvest and storage
Harvest honeydew 80–100 days after sowing, when the fruit is ripe. A ripe honeydew feels heavy for its size, the skin turns from green to a creamy yellow, and the blossom end gives slightly when pressed and smells faintly sweet. Unlike cantaloupe, honeydew does not slip from the vine, so cut it with a knife. Eat within a few days, chilled, since honeydew is best fresh and does not keep long once cut.
Honeydew vs cantaloupe in Zone 12
Honeydew and cantaloupe are close relatives, but they ripen differently and that matters in the garden. Cantaloupe tells you it is ripe by slipping from the vine; honeydew does not slip, so you judge ripeness by colour, weight and scent instead. Honeydew also takes a little longer — 80–100 days against cantaloupe's 70–90 — and needs a longer stretch of hot, dry weather to sweeten fully.
In Zone 12, grow both if you have room: cantaloupe for the early harvest, honeydew for the later one. Sow them at the same time, in the same bed, and pick cantaloupe first while honeydew finishes ripening. The two melons share pests and needs, so what works for one works for the other.
For a related crop, see our guide to when to plant cantaloupe in Zone 12.
Frequently asked questions
When should I plant honeydew melon in Zone 12?
Plant at the start of the dry season, when the soil is warm and sunny, dry months lie ahead. Seed germinates in 7–10 days and fruit is ready in 80–100 days.
How do I know when a honeydew is ripe?
A ripe honeydew feels heavy for its size, the skin turns from green to creamy yellow, and the blossom end gives slightly when pressed and smells faintly sweet.
How much space does honeydew need?
Space plants 36–48 inches apart, and allow several feet in every direction for the vines to sprawl. Give it a whole bed or a sunny corner.
Why is my honeydew not sweet?
Too much water near harvest, or picking too early, is the usual cause. Ease off watering as fruit ripens, wait for the creamy yellow colour, and give vines full sun.