Miniature greenhouses are great for boosting plant growth and helping seeds to sprout. Keeping things under cover also opens up the possibilities for growing a much broader range of plants and crops – not to mention extending its growing season. There are lots of fun ways to make your own greenhouse, to suit all levels of DIYer – and gardener! From the simplest two-cup variety that can be knocked up in seconds to the genius idea of using old photo frames to create a more substantial glasshouse, here are three of our favourites…