In the Greenhouse & Polytunnel

Despite my worries about the heat causing problems in the greenhouse and polytunnel, they’re actually doing very nicely thank you.


The aubergines are starting to develop – best plants I’ve grown for years, they obviously love the sun and heat. I’d moved a couple of plants into the cooler and more shaded potting shed but they don’t like it; yellow dying leaves at the bottom of the plant. I may have to move them back into the greenhouse although it is pretty full in there.

Aubergine Growing

Aubergine Growing Well

I’m just growing Black Beauty, useful sized fruits and a lovely glossy black skin.


The cucumber in the greenhouse is now hitting the roof. It’s climbed it’s string, grabbed the tomato’s string next door and if every flower and developing fruit comes good we can open a cucumber shop. So far we’ve had 3 good sized fruits from it.

Developing Cucumber

Developing Cucumber in the Greenhouse

I’ve 2 plants in the polytunnel which are nowhere near as developed. So far just one fruit but there are more forming. I think the reason they aren’t doing as well as the greenhouse cucumber may be the soil.

This year the greenhouse border had the top 10 cm (4 ins.) taken off and used as a conditioner on the walled veg plot. Then it was broken up with a fork and had a mixture of potato fertiliser and Growmore added before being topped back up with fresh compost.

The polytunnel growing medium was made by stripping the turf, forking and replacing the turf grass-side down followed by about 5 cm (2 ins.) of compost. It has had applications of liquid fertilisers – Miracle Gro and tomato feed along with a trace element mix (Chempack).


Well this is odd to say the least. The plants have hardly grown since being planted out but they’re producing some excellent large fruits.

Jumbo Pepper

A rather good Jumbo Pepper – considering the plants themselves are not doing well

This year I decided to plant all my peppers in the polytunnel border as they did so well in there last year. The plan was to plant out in early April, using fleece if the weather was cool.

As it happened the weather was awful, freezing cold and snowy in early April so they were pretty pot bound when they got planted out. I did tease the roots but it doesn’t seem to have helped.

Perhaps I should have potted them up a size when I couldn’t plant out but thinking about it, things were pretty crowded in the potting shed and propagators so I would have been hard pressed to fit them in.

Anyway, can’t complain about the fruits so far.


Now these are turning out to be the success story of the season. They’re laden with fruit and unless disaster strikes – like blight wiping them out – we’re looking at a bumper crop. We’ve been enjoying Sungold for a while now and the Black Russians are ripening up too.

Black Russian Sungold Tomatoes

Black Russian and Sungold Tomatoes

They’re so different from each other; the Sungold being sweet, firm, bite-sized fruits and the Black Russians are large, juicy and less sweet but well flavoured.

The hanging basket tomatoes (Red Alert) in the polytunnel are laden and the later sown Heartbreakers are trying to catch up. The bush tomatoes outdoors are coming along but they’re very much a long-odds bet. Even if the weather holds, they’re at risk of blight. Still, you never know.

Ailsa Craig Tomatoes

Ailsa Craig Tomatoes

Sungold Tomatoes Marigolds

Sungold Tomatoes and Marigolds – they are supposed to deter whitefly

Black Russian Tomatoes

Black Russian Tomatoes Hiding in the foliage

Hanging Basket Tomatoes

Hanging Basket Tomatoes in the Polytunnel

I’m going to have to stop the Sungold tomatoes and one of the Black Russians as they’re hitting the roof now!

Sungold Hitting Roof

Sungold Hitting the Greenhouse Roof

Posted in Allotment Garden Diary
6 comments on “In the Greenhouse & Polytunnel
  1. Lynn Byfield says:

    Hi all , I have just found your site and am very happy, like you I have never has such large aubergine plants in my polly and the amount of aubergines growing is crazy but nice. like my pepper plants they are huge n fruiting loads, same for my toms n cues. My polly is 10ft x 15ft and I am not sure what to plant in it to overwinter, any ideas would be welcome please.

  2. John Harrison says:

    Hi Lynn – there’s a whole section on polytunnel growing including monthly guides here:

  3. Linda May says:

    It’s the first year we’ve had a poly tunnel on our allotment and we’re growing tomatoes, peppers (2 varieties), cucumbers and aubergines. Everything’s doing well but the peppers have been seriously attacked by aphids (I think). The other plants seem to be ok. I’ve sprayed with SB Plant invigorator – the leaves still have insects on, but I think most are dead.. Some of my cucumber leaves have also gone mildewy – I’ve been removing the affected leaves but can anyone advise me how I could avoid this in future please? Is it the result of overwatering?

Leave a Comment Here on In the Greenhouse & Polytunnel

Your email address will not be published. Required fields are marked *


February 2024

What to do now on your plot!

Monthly Free Newsletter

Allotment Photo History

Our Books – A Growing Offer!

Our bestselling books for growing success!
More Information


Allotment & Garden Online Planning

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