Bitter cucumbers are masters of disguise. They may look like the crisp, slightly sweet cukes you want to eat, but once you take a bite, you may wonder, "Why are my cucumbers bitter?" Scientists have identified what makes cucumbers bitter and why that unpleasant flavor develops. Once you understand the causes, it's easy to prevent that bitter cucumber taste from ruining your next summer salad. These five easy-to-follow tips will help you avoid growing bitter cucumbers in your garden.
Why Are My Cucumbers Bitter?
Many cucumbers are perfectly delicious while other fruit, sometimes even on the same vine, are bitter. The cause is an organic compound called cucurbitacin. Bitter cucumbers contain high amounts of cucurbitacin in their fruit. All cucumber plants contain cucurbitacin but cukes grown in home gardens usually have very little of the harsh chemical in their fruit. It's mostly in their stems, leaves, and roots, where it can help deter pests such as cucumber beetles.
Cucurbitacin migrates into the fruit during stressful growing conditions. Entering from the stem end of the fruit, the bitter compound might not spread through the whole cucumber, which explains why half a fruit—the stem end—is bitter and the rest of the fruit is perfectly tasty. Cucumber skin often contains more of the bitter compound than the flesh. Removing the skin helps to remove much of the bitter flavor as well.
How to Prevent Bitter Tasting Cucumbers
The 1. Choose the right varieties.
Some types of cucumbers are, by nature, more prone to bitterness than others. Plant breeders have selected new varieties based on the amount of cucurbitacin prevalent in the plant parts and stems. Plants with lower levels of cucurbitacin are less likely to become bitter in adverse growing conditions. Popular and easy-to-find non-bitter varieties include ‘Carmen,’ ‘County Fair,’ ‘Diva,’ ‘Green Knight,’ ‘Sweet Slice,’ Sweet Success,’ and ‘Tasty Green.’
High concentrations of cucurbitacin are sometimes accompanied by digestive discomfort. As a nod to preventing unsettling digestion, plant breeders have named some new varieties “burp-less.” Expect burp-less cultivars to be sweet, not bitter, and less likely to cause unpleasant digestive problems.
The 2. Provide plenty of water.
Cucumbers are more likely to become bitter during dry conditions. The cucurbitacin compound builds up in the plant as it struggles to grow. In time, the cucurbitacin makes its way to the fruit to create a bitter cucumber. When natural rainfall is scarce, water plants deeply to ensure they receive a total of 1.5 inches of water a week. Aim to water in the morning or late afternoon so foliage can dry quickly. Fungal diseases are more likely to develop on foliage that remains moist for long periods.
If you live in a dry region, consider installing a drip line or soaker hose near cucumber plants. Ultra-efficient and easy to use, these watering systems deliver a trickle of water to the base of a plant over several hours. Pair them with a timer at the water source to make providing the exact amount of water your cucumbers need even more manageable.
The 3. Add mulch.
Spread a 2-inch-thick layer of shredded bark, straw, or grass clippings as a mulch around the base of plants to help conserve soil moisture and moderate soil temperature. Stressful growing conditions ranging from drought to heat to cold can cause bitter cucumbers. Mulch combats dry conditions by creating a barrier to limit soil moisture loss. A 2-inch layer of mulch also works to insulate the soil. The insulating power of mulch moderates temperature swings in the plant’s root zone, which helps prevent bitter fruit.
The 4. Sow cucumbers every 2 weeks.
Succession sowing, the art of planting seeds every few weeks, is a great insurance policy for bitter cucumbers. Harsh growing conditions, such as drought or excessive cold or heat, usually only last a week or two. By sowing cucumbers every two weeks beginning in late spring and continuing through midsummer, you’re likely to have many crops that ripen before or after whatever challenge Mother Nature throws your way. For example, if one sowing of vines is plagued by a heat spell and bitter fruit, the vines maturing a couple of weeks later when the heat spell passes are likely to produce sweet, crisp cucumbers.
The 5. Be patient.
When dealing with bitter cucumbers, remember this too shall pass. Generally, as soon as the problematic growing conditions subside, newly formed cucumbers will have a pleasing taste and be a welcome addition to your next Greek salad, deli sandwich, or snack tray.
Frequently Asked Questions
- Is there a method to fix bitter cucumbers?Some cucumber fans recommend milking your cucumber by rubbing two pieces of it together to draw out the bitterness. The result will be a bit of foam forming on the outside of the cucumber that you can then wipe away. While this trendy trick may work, an easier solution is to salt your cucumber to counter some of the bitter taste.
Some cucumber fans recommend milking your cucumber by rubbing two pieces of it together to draw out the bitterness. The result will be a bit of foam forming on the outside of the cucumber that you can then wipe away. While this trendy trick may work, an easier solution is to salt your cucumber to counter some of the bitter taste.
- Can you make pickles with bitter cucumbers?Yes, according to Tucker Taylor, director of culinary gardens at Kendall-Jackson Wine Estate and Gardens in Sonoma County, you should use seasoned rice vinegar to pickle your bitter cucumbers. The sweet and tart combination will mitigate the bitterness.
Yes, according to Tucker Taylor, director of culinary gardens at Kendall-Jackson Wine Estate and Gardens in Sonoma County, you should use seasoned rice vinegar to pickle your bitter cucumbers. The sweet and tart combination will mitigate the bitterness.