How To Grow Vegetables In A Greenhouse

How To Grow Vegetables In A Greenhouse.

When you start to think about the vegetables you can grow in a greenhouse the idea becomes exciting, especially, if you’re such a keen gardener you that really don’t want to wait until early Spring to get your hands dirty.

If you just love growing vegetables you’ll love a greenhouse. They give you the option of growing fresh vegetables virtually all year round.

Of course some vegetables may require a basic heating system through the winter months but they are very simple to install and very cost effective.

Choosing Your Greenhouse

There are literally 1000’s of greenhouses to choose from so you need to understand for what purpose you wish to buy the greenhouse. If you’re a beginner then maybe a smaller greenhouse to start with would be the right choice. Something else to take into consideration is the amount of space you have available.

Buying a greenhouse is quite an important part so we’ve created a separate post about how choose the best greenhouse for you.

Click here to see the post.


Decide What You Want To Grow In Your New Greenhouse

This is a very important step in learning how to grow vegetables in a greenhouse, all vegetables are different.

Vegetables have different needs such as temperature requirements, humidity requirements and light/shade requirements.

Typically we could break vegetables down into 2 categories – Warm Season and Cool season.

Warm season vegetables would be veggies like –

how to grow vegetables in a greenhouse for beginners
Get It Right And You Could Be Growing Vegetable In Your Greenhouse Just Like This.


  • Cucumber
  • Sweetcorn
  • Squashes
  • Aubergine
  • The List Goes On….

Cool Season vegetables would be veggies like –

  • Broccoli
  • Carrots
  • Potatoes
  • Onions
  • Peas
  • Radishes
  • The List Goes On….

Decide which vegetable you wish to grow then research the temperature, light and humidity requirements. Once you know this then your ready to move on to the next step.

Things You Will Need For Your Greenhouse

use a grow lamp to grow vegetables
This is the type of grow lamp we would advise you use when growing your vegetables

Let’s look at the kit you will need in order for your vegetables in your greenhouse to succeed –

1, Vegetables Seed / Plants

Click here for the best deal on seeds on

2, Plant pots –

Click here for the best deal on plant pots on

3, Potting Mix –

Click here for the best deal on potting mix on

4, Watering Cans –

Click here for the best deal on watering cans on

buy a thermostat for the greenhouse
A thermostat is a must in a greenhouse

5, Thermostat –

Click here for the best deal on  plant thermostats on

6, Grow Lamps –

Click here for the best deal on vegetables grow lights on

7, Trowel –

Click here for the best deal on trowels on


Planting Your Vegetables

Ok, so we’ve bought our greenhouse and we’ve decided where to position it. We’ve thought about what vegetables we’re going to grow in our greenhouse (also bought the seeds/vegetable plants and pots) and we’ve bought the items above off our checklist. We’re now ready to plant.

In the pots you’ve purchased fill almost to the top with potting mix. Ideally leave the soil about 2″ from the top of the pot. Dig into the potting mix and place the seeds or vegetable plants then how to grow peas in a greenhousecover any exposed roots with extra potting mix. Whatever you do don’t be tempted to push down on the soil and pack it in too tight. Instead, rock the pot gently backward and forward allowing the soil to naturally settle where it needs to around the roots.

Be sure the pots are deep enough for the roots to grow downwards. Some vegetables have deep root systems so they need room down below to grow.

We suggest arranging your newly potted vegetable plants or seeded pots so that the tallest plants are at the back and the smallest at the front. Also be sure to leave enough space around the pots so the plants can grow to their full potential without encroaching and the plant pots at the side.

Don’t forget to place adequate plant supports in or around the pots so the lanky plants, such as tomatoes and peas, will be able to take hold of them and grow tall.

Use a liquid fertilizer and thoroughly water your pots. Be sure to check that the excess water is draining away through the bottom of the pots.


The Main Things To Look Out For When Growing Vegetables In A Greenhouse

There are many things to keep an eye on in your new greenhouse so we’ve listed (what we consider) the most important down below as a little checklist.

  1. Temperature
  2. Humidity
  3. Watering
  4. Lighting
  5. Pest Infestation

Let’s go into a little detail on each of those –


Ok, temperature is very important. Whether that means too hot or too cold they can both be catastrophic to young vegetable plants.

Make sure you have thermostats installed inside and outside the greenhouse and keep an eye on them.

On cold days you will need to up the temperature by installing a heater or by using heat lamps whilst on hot days you will need to care for the plants by opening the windows and doors of your greenhouse allowing the cooler air to flow through. Hot days outdoors will mean even hotter days inside the greenhouse and the roots of your plants will dry out very quickly. On days like this extra watering will be required.


Humidity can be a very tricky thing to master. If the inside of your greenhouse is too humid this can result in the leaves of the vegetable plants your are growing becoming too wet. If the leaves become too wet there is a high risk the plants will develop a fungal infection. Mildew may also occur.greenhouse humidity control

The roof of the greenhouse will also have condensation on it which will result in drips falling. The drips from the roof will no doubt fall from the roof, drop onto an infected plant then the splash from that drip will infect the plant next to it and so on and so forth.

The idea is allow air to flow through and circulate through your greenhouse in time of high humidity.

Keeping windows and doors open at such times is a great way to keep humidity levels in check and keeping the heat up through the cooler nights will also help.


This is a simple as keeping an eye on your plants. Don’t let the dry out and don’t over water them

Some vegetables will never recover if the have been left to dry out and wilt and over watering the plants will effectively drown it and cause root rot.

This is the easiest step to master. Just be vigilant with your watering.


Your greenhouse will no doubt have a glass roof meaning there should be adequate lighting for your veggies without adding any. If, however, your plants aren’t enjoying at least 6 hours of natural light per day then you will need to invest in some.

The other thing to consider is how much work/time you intend to spend in your greenhouse. You may wish to spend some time in your greenhouse during the winter months in the evening when the sun goes down early so in that case you will need some lighting. If you think there will be enough natural light provided by the sun for you and your plants to get done what you need to get done then maybe there’s no need for lighting.

Pest Infestation

Bugs in your greenhouse can be an absolute nightmare and you need to try your very best to keep them out however you can.

We’ve put together a little list of things you can do to try and keep those little buggers out!


how to grow vegetables in a greenhouse
You Really Don’t Want Aphids
  1. Check the new plants you take in to your greenhouse for pest infestation first.
  2. Keep your greenhouse clean and tidy.
  3. Install insect netting to all doors and windows.
  4. Buy carnivorous plants and place then around your greenhouse.
  5. Introduce Lady Birds into your greenhouse.
  6. Hang bug catcher strips around the greenhouse



How To Grow Vegetables In A Greenhouse – Conclusion

Make no mistake you will need to invest a little time and money in your new greenhouse but if you get everything correct the rewards will no doubt be worth it.

There’s no reason why (if you follow the information on this post) you can’t be enjoying fresh vegetables all year round directly from your garden. The bulk of the work will be done setting up the greenhouse and as long as you maintain it regularly the veggies will grow.

We hope you’ve enjoyed this post very much and please feel free to browse the rest of our website for more useful tips, tricks and reviews 🙂

Leave a Comment

Follow by Email