Tomatoes grow best when paired with plants that attract pollinators, repel pests, improve soil health, or maximize garden space.

🍅 Best Companion Plants for Tomatoes

🌼 Flowers

  • Marigolds – Help deter nematodes and many insect pests.
  • Nasturtiums – Trap aphids and attract pollinators.
  • Calendula – Draws beneficial insects and adds color.
  • Borage – Attracts bees and may improve tomato growth.

🌿 Herbs

  • Basil – One of the best companions; may help repel hornworms and flies while attracting pollinators.
  • Parsley – Attracts beneficial insects.
  • Chives – May help deter aphids.
  • Oregano – Provides ground cover and attracts beneficial insects.
  • Thyme – Helps attract pollinators and predatory insects.

🥬 Vegetables

  • Lettuce – Benefits from shade provided by tomato plants.
  • Spinach – Makes good use of space beneath tomatoes.
  • Carrots – Grow well around tomato roots.
  • Radishes – Quick-growing crop that helps maximize garden space.
  • Onions and Garlic – Can help repel some insect pests.
  • Peppers – Have similar growing requirements and grow well nearby.

🐝 Plants That Attract Pollinators

Tomatoes are mostly self-pollinating, but pollinators increase fruit production.

  • Zinnias
  • Cosmos
  • Sunflowers
  • Bee balm
  • Lavender

🚫 Avoid Planting Near Tomatoes

  • Corn – Shares pests such as corn earworms/tomato fruitworms.
  • Potatoes – Susceptible to many of the same diseases.
  • Cabbage family (broccoli, cabbage, cauliflower, kale) – Can compete for nutrients.
  • Fennel – Inhibits growth of many garden plants.
  • Walnut trees – Produce juglone, which can harm tomatoes.

🌱 Easy Tomato Companion Planting Combination

For a raised bed or garden row:

🍅 Tomato
🌿 Basil on each side
🌼 Marigolds at the corners
🥬 Lettuce underneath the tomato canopy
🌸 Zinnias nearby for pollinators

This combination provides pest control, pollinator support, and efficient use of garden space while keeping the garden beautiful.

 

For USDA Zone 8b, the best time to plant tomatoes is:

🌱 Spring Planting

  • Transplant tomato seedlings outdoors: Mid-March to Mid-April

  • Wait until the danger of frost has passed and nighttime temperatures stay consistently above 50°F.

  • Soil temperatures should be at least 60°F, with 65–70°F being ideal.

🍅 Fall Tomato Crop (One of the perks of Zone 8b!)

Many gardeners in Zone 8b can grow a second crop:

  • Start seeds indoors in June

  • Transplant outdoors in July

  • Harvest through October and sometimes November, depending on frost dates.

For Dallas to Austin, Texas (Zone 8b)

You can generally:

  • Plant transplants outdoors around March 15 – April 15

  • Protect plants if a late cold snap is forecast.

  • Consider heat-tolerant varieties for summer, such as:

    • Celebrity

    • Heatmaster

    • Solar Fire

    • Phoenix

    • Arkansas Traveler

    • Sweet 100 (cherry)

Tomato Planting Tips

✅ Add compost before planting.
✅ Plant seedlings deeply, burying part of the stem.
✅ Mulch once the soil warms to conserve moisture.
✅ Provide a cage or stake at planting time.
✅ Water consistently to prevent blossom end rot.

Since you’re in the Austin or Dallas area, you’re actually at a great time to start planning for a fall tomato crop right now if you missed spring planting. A July transplanting can often produce excellent tomatoes once the intense summer heat begins to ease. 🍅☀️🌿

There are quite a few tricks gardeners use to grow healthier, more productive tomato plants:

🍅 Improve the Soil

🥚 Add Calcium

  • Crushed eggshells, bone meal, or a calcium-rich fertilizer can help prevent blossom end rot.

  • Consistent watering is just as important as calcium availability.

🌿 Mulch Heavily

  • Apply 2–3 inches of straw, shredded leaves, or pine needles.

  • Mulch helps:

    • Retain moisture

    • Reduce weeds

    • Prevent soil-borne diseases from splashing onto leaves

✂️ Prune for Airflow

  • Remove lower leaves that touch the soil.

  • Prune suckers on indeterminate varieties if you want larger fruit and better airflow.

  • Better airflow means fewer fungal diseases.

🐝 Encourage Pollinators

Plant nearby:

  • Zinnias

  • Cosmos

  • Basil

  • Borage

  • Marigolds

Although tomatoes are self-pollinating, more pollinator activity often increases fruit set.

💧 Water Correctly

  • Water deeply rather than frequently.

  • Aim for 1–2 inches of water per week.

  • Water at the base of the plant, not on the leaves.

☀️ Provide Afternoon Shade in Summer

In Texas summers, temperatures above 95°F can cause blossoms to drop.

  • Use shade cloth (30–40%) during extreme heat.

  • Tomatoes often start producing heavily again in early fall.

🐟 Try Natural Fertilizers

Many gardeners swear by:

  • Fish emulsion

  • Seaweed extract

  • Compost tea

These can boost plant health without overloading plants with nitrogen.

🍌 The “Tomato Planting Hole” Recipe

Many experienced gardeners add a handful of:

  • Compost

  • Crushed eggshells

  • Bone meal

  • Epsom salt (sparingly, only if magnesium is deficient)

to the planting hole before transplanting.

🚫 Avoid Too Much Nitrogen

If plants are huge and leafy but have few tomatoes, they’re likely getting too much nitrogen. Switch to a fertilizer higher in phosphorus and potassium once flowering begins.

🌻 My Favorite Companion Combination

For one tomato plant:

  • 1 tomato

  • 2 basil plants

  • 2 marigolds

  • A few green onions

  • Zinnias nearby

This creates a beautiful, productive garden that attracts beneficial insects while helping deter pests.

Since you’re interested in gardening activities for homes and schools, tomatoes are also great for a “Tomato Taste Test Garden”—grow cherry, paste, heirloom, and slicing varieties and let kids compare colors, shapes, and flavors throughout the season. 🍅🌱🌻

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