Green-fingered gardener Mr Bloom welcomes a team of young helpers, who tend to his plants and produce. In the garden, Mr Bloom and the Tiddlers discover that it takes time for vegetables to grow - the leeks having grown from very small seeds to be taller than the children are! Inside, the fun fair has come to the Nursery. Colin the runner bean has never been tall enough before to ride the helter-skelter and has even tried to cheat his way on. But will he have grown tall enough to ride this time?