Cucumber

Can Cucumber and Zucchini Grow Together? (Quick Answer)

I am here to clarify the question of whether cucumbers and zucchini can be planted together. I will also highlight the potential problems and solutions when growing these two crops together. 

Finally, we provide practical tips on how you can successfully cultivate cucumbers and zucchini side by side despite possible challenges. Good luck!

Can Cucumber and Zucchini Grow Together?

Cucumbers and zucchini are both members of the cucurbit family and require similar growing conditions, such as sunny locations, plenty of water, and well-drained, fertile soil.

However, due to their shared susceptibility to certain diseases and pests, it is not recommended to plant them next to each other. This is because diseases and pests can spread quickly from one plant to the other, endangering both. It is better to grow them separately to minimize this risk.

Both cucumbers and zucchini often suffer from mildew, gray mold, cucumber mosaic virus, bacterial soft rot, and leaf spot disease. They are also often attacked by aphids, spider mites, wireworms, thrips, and snails.

Why is it not recommended to grow cucumbers and zucchini together?

I’m happy to provide some information on why it’s not recommended to grow cucumbers and zucchini together:

1. Both cucumbers and zucchini have similar needs when it comes to nutrients, water, and soil. If they are grown together they end up competing for these essential resources. This competition can lead to stunted growth and lower yields. It’s advisable to grow them so that each plant gets the necessary nutrients, water and soil conditions it requires.

2. Cucumbers and zucchini are both susceptible to diseases like mildew, gray mold, cucumber mosaic virus, bacterial soft rot, and leaf spot disease. When grown together these diseases can spread rapidly from one plant to another. This puts both crops at risk. To minimize this danger of disease spread, it’s better to grow cucumbers and zucchini separately.

3. Both cucumbers and zucchini have similar growth characteristics such as their preference for warm temperatures and abundant sunlight. Growing them together could result in issues as they compete for space and sunlight, resulting in overcrowding and poor yields. It is therefore recommended to grow them separately to ensure they have enough space and sunlight to grow properly.

4. Since cucumbers and zucchinis have inflorescences (flower clusters) and ovaries (part of the flower) planting them next to each other may disrupt the natural pollination process essential for fruit development. It’s an idea to plant different crops alongside these vegetables in order to avoid any pollination similarities and prevent self-pollination.

5. Both cucumbers and zucchini are susceptible to pests, like aphids, spider mites, wireworms, thrips, and snails. If they are grown together these pests can easily move from one plant to another causing harm to both crops. To minimize the risk of pest infestation it’s best to grow them separately.

In summary, while cucumbers and zucchini have similar growing requirements and belong to the same family, it is not recommended to grow them together due to the risk of competition for resources, disease and pest transmission, and overcrowding. It is better to grow them separately to ensure healthy growth and good yields.

Can I still plant cucumbers and zucchini together?

Despite the challenges mentioned above, it is entirely possible to plant cucumbers and zucchini next to each other if you take these specific conditions and precautions I give you into account:

Provide enough planting space

Firstly, it is important to leave enough space between plants. Although cucumbers and zucchini are both fairly large plants, they can grow side by side if they have enough room to spread out. You should make sure that each plant has enough space to grow its leaves and fruits without interference from the other plants.

Cucumbers and zucchinis both require a minimum of 2-3 feet of space between plants and at least 4-5 feet between rows. This spacing allows the plants to grow and spread without competing for resources. In addition, it is important to provide support for the vining plants to prevent them from sprawling across the garden.

Perform regular fertilization

Cucumbers and zucchinis have similar nutrient requirements and can be grown together with proper management.

Both cucumbers and zucchini are known to be heavy feeders, meaning they absorb a high amount of nutrients from the soil during the growing phase. 

Therefore, regular fertilization is crucial for their optimal development and productivity. You can use an organic vegetable fertilizer that is rich in nitrogen, phosphorus, and potassium. 

It is recommended to apply fertilizer every two to three weeks during the growing and fruiting periods.

The recommended nutrient levels for cucumbers and zucchinis are shown in the table below:

NutrientCucumber (ppm)Zucchini (ppm)
Nitrogen100-200100-200
Phosphorus30-6030-60
Potassium200-400200-400
Calcium200-400200-400
Magnesium50-10050-100
Sulfur20-4020-40
Information source: https://hgic.clemson.edu/factsheet/fertilizing-vegetables/
https://wikifarmer.com/cucumber-fertilization-requirements-and-methods/#:~:text=Cucumber%20plants%20generally%20need%20nitrogen,the%20plant%20with%20vegetative%20growth.

Use Trellis and Shade to Protect

Both cucumbers and zucchinis benefit from trellising, which can help keep the plants off the ground and improve air circulation. However, because cucumbers are more sensitive to shade than zucchinis, it’s important to make sure that the trellis doesn’t cast too much shade on the cucumber plants.

Apply Regular Watering

In addition, both plants require a constant supply of water, especially during dry periods. However, they should not be overwatered to avoid root rot. 

A good watering practice is to water the soil deeply to ensure the water reaches the roots. In hot weather, it is best to water in the cooler morning or evening to minimize evaporation and allow the plants to absorb the water effectively.

Use Active Disease and Pest Control

Finally, proactive disease and pest control is crucial. Because cucumbers and zucchini are susceptible to some of the same diseases and pests, it is important to monitor the plants regularly and act quickly when necessary. 

For example, powdery mildew occurs very often on zucchinis, which subsequently spreads to the cucumbers. 

Take steps to prevent the spread of disease. This includes planting disease-resistant varieties, practicing crop rotation, and avoiding overhead watering. If you notice any signs of disease, remove affected plants immediately to prevent it from spreading.

Monitor your plants regularly for signs of pests, such as aphids, spider mites, and squash bugs. Handpick any pests you see and use insecticidal soap or neem oil to control infestations.

Companion Plants for Cucumbers

Good Companions:

Companion PlantInteraction with Cucumbers
BeansEnhance each other’s growth
RadishesDeters pests like squash borers and aphids
NasturtiumsDeters pests and aphids
MarigoldsDeters nematodes and pests
SunflowersProvide shade and support
DillAttracts beneficial insects
OreganoDeters pests and provides flavor
Source from: https://www.almanac.com/content/companion-planting-chart-vegetables

Bad Companions:

Companion PlantInteraction with Cucumbers
PotatoesCan compete for nutrients
Aromatic HerbsMay inhibit cucumber growth
MelonsCan lead to disease spread
Strong-Scented PlantsMay deter pollinators
CucumbersCan share diseases and pests
PumpkinsCan attract similar pests

Companion Plants for Zucchini

Good Companions:

Companion PlantInteraction with Zucchini
BeansEnhance each other’s growth
CornProvides natural trellis
RadishesDeters pests like squash borers and aphids
NasturtiumsDeters pests and aphids
MarigoldsDeters nematodes and pests
SunflowersProvide shade and support
DillAttracts beneficial insects
OreganoDeters pests and provides flavor

Bad Companions:

Companion PlantInteraction with Zucchini
PotatoesCan compete for nutrients
Aromatic HerbsMay inhibit zucchini growth
MelonsCan lead to disease spread
Strong-Scented PlantsMay deter pollinators
CucumbersCan share diseases and pests
PumpkinsCan attract similar pests

How far apart should cucumbers and zucchini be planted?

Basically, it doesn’t make a huge difference whether the cucumbers grow one meter away from the zucchinis or three meters away. 

This distance no longer plays a major role for the mildew fungal spores and pests are also unaffected by a distance of a few meters. Therefore, it is more important to take good care of your crops instead of planting cucumbers and zucchini as far away as possible.

Andreea Tapu

Andreea TAPU is a passionate gardener with over 5 years of experience in cultivating a wide variety of plants and flowers in her garden. As the author and creator of careofgarden.com, she is dedicated to sharing her knowledge and expertise with others, providing practical tips and advice to help gardeners of all levels achieve success and enjoyment in their gardening pursuits.