Enjoy a bountiful harvest of flavourful tomatoes by mastering the art of planting. Follow our field-tested horticultural guidelines to plant your tomatoes directly in the ground or in patio containers and optimize your production all summer long. Looking for the best varieties? Explore our favourite tomato picks here.
When to Plant Tomatoes?
Follow regional planting schedules to ensure sturdy, cold-resilient plants:
- Zones 4 and 5: Transplant your tomatoes outdoors during late May or early June.
- Zone 3: Wait until mid-June when frost hazards subside completely.
Why Timing Matters:
- Frost Hazards: Tomatoes cannot tolerate freezing weather. A single cold night can instantly ruin your crop.
- Soil Warmth: Ensure soil temperatures reach at least 10–15°C (50–59°F) to kickstart rapid root development and prevent fungal issues. Below 10°C, roots cannot absorb phosphorus properly.
Harden Off Plants Before Transplanting
Harden off your young seedlings over 7 to 10 days to eliminate transplant shock:
- Place your seedlings outdoors for a few hours each day, sheltered from harsh wind and direct midday sun.
- Gradually increase sunlight exposure and duration outside.
- Bring plants back indoors every evening when night temperatures fall below 10°C.
Planting in Garden Beds
Provide loose, rich, well-draining soil loaded with organic matter. Select a warm planting site that receives 6 to 8 hours of full sun daily, protected from strong winds.
Garden Bed Checklist:
- Soil Preparation: Blend mature compost or decomposed manure into your soil bed. Mix in an organic granular vegetable fertilizer enriched with calcium to prevent blossom end rot.
- Plant Spacing: Keep 50 to 60 cm between staked plants (75 to 90 cm for bushy varieties), leaving 80 cm between rows for air circulation and easy harvesting.
- Deep Planting Technique: Strip off the lower leaves along the stem, keeping only the top foliage. Bury the bare stem up to its first remaining leaves, or lay it horizontally in a trench. Stems produce vigorous feeder roots along the entire buried section while preventing buried leaf rot.
- Support Stakes: Insert a heavy-duty 1.5 m stake or metal cage right at planting to protect the root ball. Disinfect previously used stakes thoroughly.
- Strategic Sucker Pruning: Prune side shoots (suckers) growing in leaf axils on indeterminate (vining) varieties to direct plant energy into fruit development. Never prune determinate (bush) varieties.
- Initial Soaking: Water thoroughly around the base to eliminate subterranean air pockets and settle the root system.
- Protective Mulch: Spread a 5 to 10 cm layer of clean organic mulch around each plant, keeping it slightly away from the main stem to prevent rot.
- Consistent Irrigation: Water deeply at the root zone on a steady schedule. Steady moisture allows roots to uptake calcium efficiently. Never wet the foliage to keep blight and powdery mildew away.
Companion Planting: Great Garden Allies
Boost your plant vigor and naturally repel garden pests with smart companions:
- Companion Vegetables: Plant garlic and onions to defend against fungal issues. Carrots, radishes, and asparagus loosen the soil without competing for space. Peppers thrive alongside tomatoes under the exact same feeding schedule.
- Aromatic Herbs: Grow basil around the base of your plants. Basil thrives under the exact same watering and sun requirements, while its intense aromatic oils help deter insect pests. Parsley, thyme, and rosemary also make great protective companions.
- Beneficial Flowers: Plant French marigolds to suppress soil nematodes and welcome beneficial predatory insects. Nasturtiums and calendula attract pollinators while luring harmful insects away from your fruit.
Plants to Avoid:
Keep tomatoes well away from cabbage, fennel, sweet corn, peas, and beets. Most importantly, separate tomatoes from potatoes to stop late blight from spreading through your garden.
Container Gardening: Thriving in Small Spaces
Potting soil warms up quickly in spring, driving fast root growth provided your plants receive balanced food and steady moisture.
Rules for Growing in Containers:
- Select Compact Varieties: Choose determinate (bush) or dwarf cultivars. These produce generous crops on tidy, manageable stems. Plant one single specimen per container.
- Container Volume: Select a container holding at least 20 litres (30 to 40 litres is ideal) equipped with drainage holes.
- Premium Potting Mix: Combine equal parts (50/50) of high-grade compost and Botanix Flower and Vegetable Potting Soil.
- Balanced Feeding: Blend a slow-release granular tomato fertilizer into the lower two-thirds of the potting mix. Thoroughly blend the nutrients into the substrate so roots grow deep without burning tender feeder roots.
- Deep Transplanting: Strip lower leaves carefully and submerge the bottom stem to develop a massive root network.
- Consistent Moisture: Irrigate as soon as the top layer of soil dries out. During heatwaves, water daily early in the morning to maintain even moisture and prevent blossom end rot. Secure your plant support cage into the container on planting day.
- Container Companion: Add sweet basil or a French marigold around the rim of your container to beautify and protect your plant.
Put these steps into action this season and harvest delicious, homegrown tomatoes all summer long!
