Check Out Our Our New Seed Shop

How to Feed Cucumbers – Best Feed to Use, NPK Etc.

This article on feeding cucumbers explains the best fertiliser mixes to use for growing cucumbers for the home gardener.

Use the Right Feed Mix for Better Cucumbers & More of Them!

Feed Cucumbers

Better results for the same effort but better feeding

Greenhouse cucumbers are generally grown in the same house as tomatoes, peppers and aubergines by home gardeners and naturally enough the gardeners tend to just feed the cucumbers with the same feed they are using for the tomatoes.

A tomato feed will be near ideal for peppers and aubergines, all three belong to same family, solanaceae, as potatoes but cucumbers are cucurbits – members of the Cucurbitaceae family – like courgettes, marrows, pumpkins and squashes. A tomato feed is not ideal for this family and especially not the cucumber.

Generally the result of feeding cucumbers with a tomato feed are acceptable but much better results can result if you feed cucumbers with a more appropriately balanced fertiliser.

High Nitrogen Requirement in Cucumber Feed

By looking at a mature cucumber plant it’s apparent the leaf area is much greater than a mature tomato plant. Since the fuel of leaf growth is nitrogen, it’s obvious that cucumbers require more nitrogen than the other major nutrients, unlike tomatoes whose prime need is for potash. A good quality tomato feed will supply the major nutrients (NPK) in a ratio around 10:10:30 usually with added nutrients such as magnesium and other trace elements.


Burpless Tasty Green Cucumbers

Looking at the recommendations for commercial cucumber growers, they agree that a much higher nitrogen level is required along with magnesium, calcium and other trace elements like boron, iron and manganese.

Easily Available Fertilisers to Feed Cucumbers

Fairly near to the commercial fertilisers would be Miracle Gro with its base NPK level of 24:8:16 plus trace elements although this is deficient in magnesium and calcium compared to commercial cucumber feed. Magnesium is easy enough to add in with some epsom salts and calcium feeds can be purchased.

Another option is to use S-Chelate 12-Star which provides calcium in a chelated form so remaining bio-available along with NPK and other micro-nutrients.

Organic Fertilisers

Many organic growers will use comfrey liquid as a greenhouse tomato feed. It’s well suited to this as the NPK ratio is very similar to commercial tomato feeds but, once again, it’s not ideal to feed cucumbers.

A better organic feed for cucumbers would be a nettle tea, made by steeping nettles for 3 to 6 weeks in water. Another organic liquid high nitrogen feed that would benefit cucumbers can be made by steeping a hessian sack full of fairly fresh horse droppings in a barrel of water until the water turns dark brown. This is called a muck tea.

A good level of home-made compost in the border should provide the trace element requirements to feed cucumbers.

Causes & Prevention of Bitter Tasting Cucumbers

Causes & Prevention of Bitter Tasting Cucumbers

Growing your own cucumbers usually produces lovely fresh fruits but sometimes you're shocked by an awful bitter taste. This article explains the causes of bitterness in cucumbers and how to prevent bitter cucumber. What Makes a Cucumber Taste Bitter...
How to Prune Trailing Cucumbers – Pruning Cucumbers

How to Prune Trailing Cucumbers – Pruning Cucumbers

Why Prune Cucumbers? Cucumbers are rather like indeterminate tomatoes, given half a chance they'll take over, filling the greenhouse with haulm (stems and leaves). What we actually want are the fruits and enough leaves to support their production, not...
How to Grow Pickling Cucumbers in a Container

How to Grow Pickling Cucumbers in a Container

The COVID-19 crisis has turned many people onto gardening and producing their own food. A container garden is a great way to start and one of the vegetables that you can plant is a cucumber. Cucumbers are vining plants, and it doesn’t require a...

Free Newsletter

Our Books – A Growing Offer!

Our Growing Books

Our bestselling books for growing success!
More Information

Allotment & Garden Online Planner

Free Trial - Allotment Planner
Personal Planting Updates & Tips
by email twice a month

Allotment Garden Planning Software