How to Grow Tomatoes in Straw Bales- 2 Easy and Cheap Creative DIY Project7 min read

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Straw bale gardening is probably the most fun you’ll have growing your own food and herbs, requiring almost no work or maintenance.

How to Grow Tomatoes in Straw Bales-DIY # 1

Many gardeners utilize wire cages to provide growing tomatoes with support. Unfortunately, lesser-quality cages will buckle under the weight of your tomatoes, which can yield 10 to15 pounds of fruit under optimal conditions.

Another option that requires little space and investment is a straw bale, which provides an ideal environment for several vegetables, including tomatoes.

1.Locate an area in your backyard or garden in full sun. Spread a layer of newspaper on the ground to prevent weeds from growing around the straw bales and helps ensure the twine doesn’t degrade.

2.Set two to three bales on the newspaper. Leave the twine to help the bales stay intact throughout the growing season.

3.Dampen the bales for the first three days. For the next week, fertilize the hay bales with a mixture of 8 tablespoons of bone meal, fish meal or compost per gallon of water required to dampen each bale. Begin this process in the spring after all danger of frost has passed.

4.Check the straw bales’ temperature by inserting your arm into the center of each. If the center is cool, or at least below your body temperature, the bales are ready for planting. If they’re still warm, continue to dampen each and monitor the temperature.

5.Create five 3 to 4-inch deep holes with your hands or a small rake. Lower a single tomato seedling into each hole, making sure the seedlings aren’t smothered by the straw. Cover each seedling with approximately two cups of compost before providing a healthy drink of water.

6.Feed the growing tomatoes with a fish emulsion or compost tea once every two weeks. As the tomato plants begin to grow larger, switch to fertilizing the bales once per week. Water the bales as needed to keep them evenly moist.

7.Harvest the tomatoes once they are completely ripe and bright red. Store your ripe tomatoes in an environment between 55 and 70 degrees Fahrenheit.


Things You Will Need:

1.Newspaper
2. 2 to 3 straw bales
3.Bone meal
4.Fish meal
5.Compost
6.Tomato seedlings

Tip

1.Near the growing season’s end, or when temperatures drop below 40 degrees Fahrenheit, pick immature, green tomatoes and allow them ripen in temperatures around 70 degrees Fahrenheit.

2.Several varieties of tomato, including Valerie, Jet Star Hybrid, Sungold, Large Cherry Red and Yellow Pear, thrive in cooler coastal climates.


How to Grow Tomatoes in Straw Bales-DIY # 2

This traditional method of growing tomatoes in straw bales and other tender plants like peppers and cucumbers is a great way to produce an early crop in our uncertain climate.

Basically the straw bale is being composted and the heat from that process encourages the plant growth. Outdoors the method can also be useful for pumpkins and squashes, courgettes and marrows.

The straw bale method can be used to good effect in an unheated greenhouse, a polytunnel or for growing outdoors. It’s also useful for growing tomatoes outdoors where the soil is thin and poor or even on a patio or paved yard.

At the end of the growing season the straw bale should have decomposed enough to be put on the compost heap or mulched.


Recommended : How To Build A Root Cellar In Your Backyard


Finding Straw Bales for Growing Tomatoes

The big problem nowadays is actually getting hold of suitable straw bales. Most large arable farmers produce straw which is rolled into huge cylindrical bales for mechanized handling rather than the traditional bale around 20Kg to 30Kg that a man can lift (with care).

The other problem is that the crop may have been treated with a selective weed killer and the residue of this will kill your tomatoes.

Ask around at stables, farm markets etc. and you should be able to find a farmer who will sell you a few bales but do ask about what chemicals have been used if he’s not an organic farmer.

The ideal is wheat straw, although barley or oat straw can be used. An alternative that may be easier to find is hay bales but hay tends to contain weed seeds that may germinate and become a problem. Hay isn’t really ideal because of its structure either but if you cannot find suitable straw bales then it is an option.

Preparing the Straw Bales

If possible, dig a shallow trench the same size as the bales and line with polythene to retain water in the bale or just sit on polythene as a second choice.

Place the bales in position with the straw sitting vertically as this helps it to absorb the fertiliser we’re going to be adding. First of all wet the bale thoroughly using a fine rose on your watering can with a nitrogen rich solution.

Traditionally and organically this was urine mixed 1:5 with water. This may be somewhat unpleasant but urine is sterile when produced and doesn’t present a health hazard. You’ll also need quite a lot which can be a problem.

Another method is to wet the bale and then sprinkle with 500gr to 750gr of nitro-chalk fertiliser and water in, repeating this some 3 or 4 days later. An organic equivalent of nitro-chalk would be to use double that amount of dried blood.

Both the methods above are relatively slow, taking around three weeks to get the bale ready to plant. In the days when some commercial glasshouse tomato growers used straw bales they worked with a faster method said to take 7 to 10 days.


Thoroughly wet the bale and then sprinkle with a mix of:

  • 500gr nitro-chalk

  • 450gr Superphosphate

  • 350gr Potassium Nitrate

  • 150gr Magnesium Sulphate (Epsom Salts)

  • 75gr Ferrous Sulphate (Sulphate of Iron)

Thoroughly water in the above mix. You’ll still need to feed as you grow but it provides a good basic environment for tomatoes.

Keep the bale damp, if it dries out it will stop the composting process. After a few days to a week the straw should begin to warm up due to the microbial action. It will also be giving off CO2 which is a benefit to plant growth in a greenhouse or tunnel. The warmer the environment, the faster fermentation will start and run.

Ideally you need a compost thermometer with a long probe to measure the temperature inside the bale although the old timers relied on touch and experience. It should rise to at least 43ºC, often getting up to 54ºC.

Check the temperature every day or two, it will rise to the peak and then start to fall. When it drops from the peak temperature to below 38ºC you’re ready to start planting.

Planting in Straw Bales

Start by making a hole in the top of the bale and putting a couple of handfuls of compost in. Plant tomatoes deeply, they have tiny hairs on their stems called adventitious roots, which is the start of root formation. Planting deeply means the plants will produce more roots which will help to improve the plant’s root structure and enable it to take in more nutrients.

With vine tomatoes growing up canes or strings you can fit 3 or 4 plants per bale (more with larger bales, obviously) but bush tomatoes take more room so less plants per bale.

It’s important to remember the benefit of the straw bale method is primarily the warmth around the base of the plant and that the straw does not provide any nutrients. You must feed regularly – I’d suggest twice a week – with a high potash fertiliser. Either proprietary tomato feed like Tomorite or Chempak or organic feed like comfrey tea or sheep’s manure tea.

At the end of the season the straw bale can go onto the compost heap – cut the twine to allow the straw to spread and mix with grass cuttings for best results.

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