When to Sow Watermelon?
Watermelon is a popular garden vegetable grown across temperate climates. Below you'll find exact sowing dates, growing requirements, recommended fertilization and companion plants — all from our plant database. Click the button to see dates personalised for your region in the interactive planner.
Sowing dates – 🍉 Watermelon
| Sowing dates | Watermelon |
|---|---|
| Indoor sowing | Apr–May |
| Transplanting | May–Jun |
| Direct sowing | — |
| Harvest period | Aug–Sep |
| Days to harvest | 90 |
| Spacing | 100 × 150 cm |
| Sowing depth | 2 cm |
| Days to germination | 8 |
Growing requirements
Watermelon (Citrullus lanatus) belongs to the family: Cucurbit. The requirements below come straight from the app database – you will see the same values on the plant card in Gardener Planner.
| Sunlight | high |
| Water | medium |
| Soil | sandy |
| pH | 6–6.8 |
| Family | Cucurbit |
Fertilization (NPK)
Approximate nutrient demand. For precise doses, test your soil first – the NPK fertilizer calculator will do the math for you.
| Nitrogen (N) | medium (8–12 g/m² per season) |
| Phosphorus (P) | medium (50–70 mg/l in soil) |
| Potassium (K) | high (150–200 mg/l in soil) |
Companion planting
Good companions reduce pests and diseases and make better use of bed space. Click a vegetable to see its sowing dates.
Good companions: Corn, Beans, Radish, Dill
Bad companions: Potato, Cucumber, Zucchini, Pumpkin
Plan your Watermelon in the app
Gardener Planner lets you match sowing dates to your climate zone, track progress and plan crop rotation across your whole garden.
Open Gardener Planner →Frequently asked questions
When to sow Watermelon indoors?
Sow Watermelon indoors from Apr–May. Seedlings are ready to transplant after about 6–8 weeks.
When to transplant Watermelon?
Transplant Watermelon outdoors from May–Jun, after the last frost.
When to harvest Watermelon?
Harvest Watermelon from Aug–Sep (approx. 90 days from transplanting/germination).
What spacing and sowing depth?
Spacing: 100 × 150 cm. Sowing depth: 2 cm. Days to germination: 8.
What to plant next to Watermelon?
Good companions: Corn, Beans, Radish, Dill. Bad companions: Potato, Cucumber, Zucchini, Pumpkin.
When to Sow? – Sowing dates for every vegetable
🍅 Tomato · 🥕 Carrot · 🥒 Cucumber · 🥒 Greenhouse Cucumber · 🥬 Lettuce · 🫑 Pepper · 🥔 Potato · 🧅 Onion · 🥬 Cabbage · 🫘 Beans · 🫛 Peas · 🥬 Radish · 🥒 Zucchini · 🎃 Pumpkin · 🧄 Garlic · 🥬 Leek · 🥬 Spinach · 🥬 Beetroot · 🥦 Broccoli · 🥬 Cauliflower · 🥬 Kohlrabi · 🥬 Celery · 🌿 Parsley · 🥕 Parsnip · 🍆 Eggplant · 🌽 Corn · 🍠 Sweet Potato · 🥬 Asparagus · 🥬 Turnip · 🥬 Brussels Sprouts · 🥬 Kale · 🥬 Swiss Chard · 🥬 Arugula · 🥬 Endive · 🥬 Rhubarb · 🌿 Horseradish · 🌿 Fennel · 🥬 Artichoke · 🥬 Okra · 🥬 Watercress · 🌿 Chives · 🌿 Basil · 🌿 Dill · 🌿 Mint · 🌿 Thyme · 🌿 Rosemary · 🌿 Sage · 🌿 Oregano · 🌿 Cilantro · 🌿 Lovage · 🥬 Sorrel · 🫛 Broad Beans · 🍓 Strawberry · 🍈 Melon · 🥬 Pak Choi · 🎃 Pattypan Squash · 🥬 Lamb's Lettuce · 🥔 Jerusalem Artichoke · 🌿 Tarragon · 🌿 Lemon Balm · 🌿 White Mustard · 🌿 Phacelia