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9 Companion Plants You Should Never Grow With Tomatoes

Companion planting is a gardening technique where different plants are grown together to benefit each other in various ways. While tomatoes are a popular choice for many gardeners, it’s essential to be mindful of their companions. Some plants can enhance the growth and flavor of tomatoes, while others may hinder their development or attract pests. In this article, we’ll explore nine companion plants that you should avoid growing with tomatoes to ensure a successful harvest.

1. Basil

Planting aromatic basil near tomatoes not only enhances their flavor but also deters pests like aphids and tomato hornworms. However, excessive basil growth can overshadow tomato plants, so it’s essential to maintain a balance.

2. Marigolds

Vibrant marigolds not only add visual appeal but also emit a strong scent that repels pests, making them ideal companions for tomatoes. However, planting them too close may compete for space and nutrients, so ensure proper spacing.

3. Nasturtiums

Colorful nasturtiums not only beautify your garden but also serve as natural pest repellents, protecting nearby tomato plants from aphids and whiteflies. However, they can spread rapidly, so keep them in check to prevent overcrowding.

4. Garlic

Planting pungent garlic alongside tomatoes can help ward off common pests and diseases, safeguarding the health of your tomato plants. However, garlic requires adequate spacing and may compete with tomatoes for resources if planted too closely.

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5. Onions

Besides being a kitchen staple, onions act as a natural insect repellent, creating a protective barrier against pests that may harm tomato plants. However, onions have shallow roots and may compete with tomatoes for water and nutrients, so space them accordingly.

6. Carrots

While carrots and tomatoes have different soil requirements, interplanting them can improve soil structure, benefiting both crops in your garden. However, carrots may attract pests like carrot flies, which can also damage tomato plants, so monitor closely.

7. Peppers

With similar growing conditions, peppers and tomatoes make compatible companions, thriving alongside each other in your garden. However, both plants are susceptible to similar pests and diseases, so practice proper crop rotation to minimize risks.

8. Lettuce

Placing leafy lettuce near tomatoes not only provides shade for their roots but also helps retain moisture in the soil, promoting healthy growth. However, lettuce has shallow roots and may compete with tomatoes for nutrients, so maintain adequate spacing.

9. Spinach

Dense spinach foliage not only shades the soil, reducing moisture loss, but also suppresses weeds, creating an optimal environment for tomato plants to flourish. However, spinach requires consistent watering, which may affect tomato plants’ water uptake if not managed properly.

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