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It can be much trickier changing the soil in a greenhouse trench than in a garden border. I’m lucky to have trenches with brick bases, but my heart goes out to anyone with borders glazed to the base. It's so easy to break panes when excavating soil

Make sure your greenhouse ventilation is constantly regulated during hot summer months, whether you're at home or not, by installing an automatic vent opener. Readily available, they're quick and easy to install, so heat-stressed plants will be a

Where you place a new greenhouse or polytunnel can make the difference between growing success and failure, so it’s important to get it right. With careful siting, it should be possible to optimise the productivity of your structure, which helps

base rail, you can make one using lengths of 70 x 45mm timber, cut to length, then bolted on to the foundation tubes.Add a base railYou can buy anti-hot spot tape from most polytunnel/greenhouse suppliers. Place a strip along each hoop to cushion

Buying a greenhouse structure from a supplier, then assembling it yourself can save you more than £300 on construction costs - and the bigger the structure, the more you'll save. On top of building costs, you'll be saving on ground levelling

to its proper place in the greenhouse.More on greenhouse gardeningAdvice on gardening under glass.How to fit an automatic greenhouse vent opener.Learn how to sow seeds indoors.Browse our collection of tender plants.

before replacing the pots.More advice on feeding and watering plantsHow to save water in your gardenHow to "fit guttering on your greenhouseTips on watering your plantsHow to water hanging basketsFeeding your plantsMulching beds and borders, with advice

, the fill the trough with compost and plant the sempervivums. Finish off with a layer of gravel mulch.AdamYou can buy slates from reclamation yards, or you might be lucky to find some lying around in your own or a friend's garden.More garden DIY projects

Chris Beardshaw demonstrates a method for training greenhouse tomatoes, intended to increase fruiting yield.summerMore on growing tomatoesRead Kate Bradbury's blog on the dos and don'ts of growing tomatoesGrow tomatoes from seedGrow tomatoes outside

in the garden, on a balcony or in the greenhouse. Shake compost inside the bag to create an even, pillow shape. Cut a slot out of the bag to expose the compost for planting them into.Loosen the compost in the bag with a hand fork. Push some of the compost