Growing cucumbers on trellises or supports is one of the smartest ways to save space, keep fruits clean, and improve airflow. But many gardeners miss a powerful opportunity: using the soil underneath cucumber vines to grow beneficial companion plants.
The right plants under cucumbers do far more than fill empty space. They can:
- Repel harmful insects
- Attract pollinators
- Improve soil fertility
- Reduce disease pressure
- Shade the soil and retain moisture
- Increase overall cucumber yield
When chosen correctly, companion plants create a mini-ecosystem that benefits both sides. Below are the 9 best and most common plants to grow under cucumbers for healthier plants and bigger harvests.
1. Marigolds (Tagetes)
One of the strongest companions for cucumbers.
- Repel aphids, whiteflies, cucumber beetles, and nematodes
- Attract beneficial insects and pollinators
- Reduce soil-borne pests naturally
- Compact growth fits perfectly under trellises
Marigolds also add vibrant color and help protect cucumber roots from underground pests.
2. Dill
Dill is a powerful ally in any cucumber bed.
Benefits:
- Attracts ladybugs and parasitic wasps (natural pest control)
- Improves pollination
- Does not compete heavily for nutrients
- Enhances cucumber flavor when grown nearby
Let dill grow lightly scattered beneath or beside cucumber plants.
3. Nasturtiums
A beautiful and extremely useful companion.
Benefits:
- Acts as a “trap crop” for aphids and whiteflies
- Repels cucumber beetles
- Spreads along the soil as a living mulch
- Edible leaves and flowers
Nasturtiums protect cucumbers by luring pests away from them.
4. Radishes
Fast-growing and highly practical.
Benefits:
- Deter cucumber beetles
- Break up compact soil
- Mature quickly before cucumbers need full space
- Improve soil aeration
They are perfect early companions that prepare the soil while cucumbers establish themselves.
5. Lettuce
Ideal for shade-loving undergrowth.
Benefits:
- Thrives in partial shade from cucumber leaves
- Keeps soil cool and moist
- Prevents weed growth
- Harvestable before cucumbers fully spread
Leafy greens like lettuce maximize garden productivity without harming cucumbers.
6. Spinach
Another excellent low-growing partner.
Benefits:
- Uses shallow soil layers
- Reduces moisture evaporation
- Suppresses weeds
- Grows quickly in spring or fall
Spinach fills empty soil while cucumber roots grow deeper.
7. Bush Beans
One of the most valuable companions.
Benefits:
- Fix nitrogen into the soil naturally
- Improve soil fertility
- Support cucumber leaf growth and fruit production
- Compact varieties fit under trellises
More nitrogen = stronger vines and higher yields.
8. Chives
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