How to Grow Cucumbers: A Complete Guide for Success

Cucumbers are one of the most dynamic veggies in the world and they boast impressive nutritional value. Whether you plant them for fresh eating, to pickle, or to use in juices and smoothies, nothing can match the flavor of a homegrown cucumber! 

But if you think growing cucumbers should be easy and not take much effort, you’d be wrong! Cucumbers can be emotionally draining and frustrating for the gardener.

With tips on seed choices, the best way to trellis, fertilizing, pest control, and more, this guide explains why cucumbers can be challenging to grow and how to grow cucumbers to make them thrive.

Cool As A Cucumber

Learning the best growing practices will help you stay cool as a cucumber all season long! Maximize your harvest while saving space by learning how to grow vertically with this DIY Cucumber Trellis Guide.

Then, use these other growing guides to eliminate the guesswork of gardening:

• How to Grow Tomatoes

• How to Grow Peppers

• How to Grow Eggplant

• How to Grow Peas

• How to Grow Green Beans

• How to Grow Melons

• How to Plant Potatoes

Varieties of Cucumbers

When it comes to cucumbers, there are lots of nuances between varieties. Not all cucumbers are alike and not all cucumbers are great for pickling. If you’re still deciding which varieties to grow, browse the types of cucumbers to find the perfect variety for your garden this season. 

When to Plant Cucumbers

Timing is everything when it comes to seed starting. Start your cucumber seeds indoors 1-2 weeks before the last frost. (Use this link to find the last frost date in your area.) 

This should give you about 5 weeks before they will be planted in the garden. Plant them out in the garden when the soil temperature has reached 60°F. Begin hardening off seedlings 5-7 days before you want to put them out in the garden.

Succession sowing can be your best friend when it comes to growing cucumbers! I succession sow cucumbers about every four weeks here in Michigan, starting in mid to late May. 

If the first planting doesn’t work out, the second planting might. Sometimes even the first two plantings don’t work out, but the third and forth planting grow beautifully. 

How to Grow Cucumbers

Follow these steps so you'll have plenty of fresh cucumbers to enjoy:

1. Sunlight - You should choose a location that provides at least 5 hours of direct, full sunlight daily, but 9 to 9 ½ hours is ideal. Sunlight is crucial for cucumbers; the more sun you give them, the better. 

2. Check Soil pH Levels - Avoid extremes on the pH scale. Cucumbers like a neutral pH between 6 and 7. If the soil is too acidic or alkaline, add more compost to balance the pH. Pro-Tip: Don’t unnecessarily alter soil pH. Perform a soil test with the Rapitest pH Meter so that you can adjust the pH based on what your soil needs, not a guess.

3. Amend the Soil - More important than soil type, cucumbers need well-draining soil. Amend dense soil with compost to create loose garden soil. If you have heavy clay soil, add sand for drainage.

4. Plant Spacing - Bush varieties should be planted about 12 inches apart. Vining varieties should be planted 1 to 1½ feet apart when trellising them and at least 3 feet apart in mounds when growing in-ground. Pro-Tip: Plant cucumber seedlings as close to the trellis as possible to allow the tendrils to reach the trellis quickly.

5. Planting Depth - Some people recommend planting cucumber seedlings a little deeper than the soil level. A better suggestion is to plant them at the soil level and then mound them up a little as needed later on.

6. Water - Water the cucumbers after planting. Generally, cucumbers need about an inch of water per week, so soak them deeply each time you water and allow time for the top 3 inches of soil to dry out between waterings. 

Cucumber Flowers & Proper Pollination

Cucumbers will produce both male and female flowers on the same plant. You can tell the difference between the two because there is a swelling at the base of the female flowers, which will later set fruit.

Some gardeners believe that removing the male flowers will allow the plant’s energy to concentrate on the female flowers, but the plant relies on both the male and female flowers for pollination, so don't remove the male flowers.

A pollinator needs to transfer pollen from the male flower to the female flower up to nine times to get proper fruit set! If that doesn’t happen, you may end up with really weirdly shaped cucumbers.

Several factors can contribute to inadequate pollination of cucumber flowers. First, at temperatures below 40°F, pollen can be very difficult to transfer. Similarly, extreme heat can render the pollen sterile or cause plant stress, leading to the flowers simply dropping off the plant.

Also, conditions that are too wet and humid can cause pollen to mold or rot, making it unviable. Lastly, a lack of pollinators (such as honeybees, butterflies, and flies) can lead to inadequate pollination and improper fruit set.

If you grow cucumbers, you may sometimes get misshapen fruit. But keep at it and keep caring for the plants the way you should, and you will get good-quality cucumbers, too.

Fertilizing Cucumbers for Maximum Yield

Support your cucumber plants by giving them a healthy start with a high-nitrogen all-purpose fertilizer. Cucumbers need more nitrogen at first to grow the vine and leaves, and you don’t want them to set fruit at a young age.

The fertilizer that I use and recommend for my cucumbers is Trifecta+. If you want to use something different, look for an NPK ratio of 10-7-7. 

Trellising Cucumbers

Cucumbers can be grown sprawling along the ground, but just like trellising grapes or trellising peas, I find it very beneficial to grow them vertically. Using a DIY cucumber trellis, you can maximize space in your garden, make them easier to prune, allow more pollinators to access the flowers, make them easier to harvest, and allow better airflow to keep the cucumber plants healthier.

Whatever you use to support your cucumbers should be sturdy enough to support all the foliage and fruit once they form. Pro-Tip: One of the best ways to prevent powdery mildew is to give cucumbers plenty of space and good airflow by trellising.

While you are training your cucumber plants to the trellis, take time to prune off excess growth! That extra foliage increases the plant's overall volume, reduces airflow, and slows fruiting and plant growth. Watch the video above to learn how to prune cucumbers.

Common Pests & Diseases

Cucumbers are very stress-prone and not very good at uptaking water. Extended periods of heat or drought will bring on that stress, weakening the plant’s immune system and exacerbating problems. Stress can trigger diseases and attract pests such as whiteflies and cucumber beetles.

The first problem most people encounter when growing cucumbers is cucumber beetles, which transmit the disease cucumber wilt. Cucumber wilt can essentially cause the plant to die back entirely.

An infestation of cucumber beetles can occur almost any time of year, from early May to late August, but they have a peak season in June. To learn more about cucumber beetles and what to do to prevent them, watch this video on cucumber beetle control methods.

To reduce pests including cucumber beetles, apply organic pesticides, like spinosad, early and often. Another surprising way to combat pests is to water cucumber plants a little more frequently and use shade cloth in hot weather.

Cucumbers are also very susceptible to powdery mildew. Use these resources to prevent powdery mildew and protect your plants from blossom end rot. 

Harvesting Cucumbers

Once you know how to grow cucumbers, it's fun to snack on cucumbers fresh from your garden. When they reach the desired size, start harvesting them. Remove any fruit from the vine that you won't use, or production will cease.

Harvest pickling cucumbers daily. The fruit will keep in the refrigerator for about a week, but for best quality, use or preserve them immediately.