Planting
When to Plant Cucumbers
Cucumbers are heat-loving crops that don’t handle cold weather well, and generally don’t like to be transplanted. That’s why it’s best to directly sow seeds outdoors no earlier than 2 weeks after the last frost date of spring, or when soil temperatures are around 70ºF (21ºC). Covering the soil with black plastic mulch a few weeks before planting can speed planting times along if needed.
Although cucumbers grow relatively quickly, some gardeners may choose to plant cucumber seeds indoors for an earlier crop. If you decide to go this route, start the seeds about 3 weeks before you intend to transplant them and only transplant the seedlings outside when nighttime temperatures stay consistently above 50ºF and the seedlings have been properly hardened off.
If you want to enjoy even more cucumbers, you can make successive plantings of seeds every 2 weeks through mid-summer.
Where to Plant Cucumbers
Cucumbers like warmth and lots of light, so select a planting site that gets at least 6 to 8 hours of direct sunlight per day.
These plants also require fertile soil and adding about 2-inches of aged manure and/or compost and a complete fertilizer to the area before planting helps cukes grow even better. Make sure the soil is moist but well-draining and has a pH of around 6.5 to 7.0 too.
Depending on your space, you can grow cucumbers in in-ground gardens or raised beds, or in containers or grow bags that are at least 5-gallons in size. Container planting is best for bush-type cucumbers or vining varieties that are kept tidy with a trellis.
How to Plant Cucumbers
- To plant cucumber seeds directly outdoors, sow 2 seeds about 1 inch deep per planting hole and space holes 12 to 18-inches apart in rows that are about 4-feet from each other. Alternatively, you can also plant 2 to 3 cucumber seeds together in mounds or “hills” spaced 1 to 2-feet apart and thin the seedlings to one plant per hill when the plants are around 4-inches high.
- To start cucumber seeds indoors, sow 2 seeds 1-inch deep in 4-inch biodegrable pots, water well, and place the pots on a heating mat set at about 70ºF (21ºC) to speed up germination. Once the seedlings emerge, remove the weakest plants so you’re left with 1 plant per pot. When it’s time to transplant seedlings outdoors, harden the plants off carefully, plant biodegradable pots along with your cukes to minimize root disturbance, and water well.
- After planting cucumbers, mulch the area with straw, chopped leaves, or another type of organic mulch to keep pests and weeds at bay. If you’re growing vining-type cucumbers, install a trellis when you plant them. I like to grow cucumbers on a cattle panel trellis, but you can also create a simple trellis or support structure with wood or bamboo.
Growing
Watering
Cucumbers are thirsty plants and should be watered consistently with about 1-inch of water per week. Plants need even more water during high heat or if you’re growing them in containers. Remember, inconsistent watering leads to bitter-tasting fruit and may cause issues like blossom end rot.
When watering, allow the water to deeply saturate the soil and do your best to avoid getting the plants’ leaves wet. Damp cucumber leaves are much more likely to develop mildew issues!
Fertilizing
Blending compost or aged manure and a balanced fertilizer into the soil helps cucumbers produce bigger harvests. After that, just side-dress plants with a balanced or high potassium fertilizer, such as tomato feed, when they begin to produce flowers and fruit.
Pruning or Maintenance
Bush-type cucumbers don’t need pruning, but vining varieties do. For these plants, remove any leaves on the lower 6-inches of vine once the plants are suitably sized and pinch off any suckers you see too.
Adding mulch around cucumbers works to retain soil moisture and reduce weeds. However, it’s best to not apply mulches until the soil has warmed to around 75°F.
Seasonal Care
If you’ve struggled with pests in the past, planting cucumbers a little later in the season can help you avoid issues with cucumber beetles and other nuisance insects. You may also want to cover young plants with row covers to reduce pests. Just make sure to remove coverings when the plants produce flowers to allow pollinators to get to work.
Once cucumbers start fruiting, you’ll need to be ready and harvest plants often. Cucumbers that aren’t picked in time quickly turn yellow and bitter!
Types
There are two main types of cucumbers: vining cucumbers, which grow on vigorous vines and require trellising, and bush cucumbers, which have a more upright habit and are better for pots. You can also choose between slicing cucumbers, which are ideal for salads, and pickling cucumbers that retain the best crunch when canned. Here are just a few of my favorites:
- ‘Boston Pickling’: this vining heirloom is prolific and bred especially for pickling.
- ‘Burpless Bush Hybrid’: a bush variety that’s slow to bitterness and good for small gardens, pots, or pickling.
- ‘Shintokiwa’: My favorite slicing variety, this Japanese heirloom yields long straight fruit with a fresh, crisp flavor.
More Like This
The sooner you thin your cucumbers the better. You may not be able to save the tiny plant that you pull up. You can try to plant them in small pots with potting mix to see if they will survive.
Dennis, see Dianne’s comment above. Unbalanced soil would be our first thought, too. Was the manure “new”—aka hot, fresh, less than 1 year old? Shouldn’t be. It will “burn” baby plants (and adults, too, make no mistake about it). If that’s the case, and the plants have any sign of life, you might uproot them asap and reset them into some soilless seed mixture just long enough for them to come back strong. If they’re not salvageble, start again. From the ground up.
For the best crop yield you should choose seeds of a self-pollinating variety. Unless it is a bush-type, the vines will get quite long so consider using a trellis to grow them up or a hanging basket to let them cascade down. They need a lot of light - a minimum of 6 hours of sun per day - to grow really well so you might have to consider using a growlight to supplement natural daylight, especially in winter. They also like it warm, around 70 degrees with a slight drop in the evening. Depending on the variety you choose it could take 60 days or more to get edible-sized fruit. Good Luck!
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