A gardener has issued a warning to British green-thumbed enthusiasts ahead of the growing season. The colder months of spring are the perfect time to get shrubs established before warmer temperatures set in. Tim Marshall, Raby Castle’s head gardener, has reminded Britons that watering is pivotal for the growth of all living plants, whether they’re growing in the ground or inside a container. There are various ways to water plants, however, with each method offering its own set of advantages and disadvantages. What’s more, watering mistakes can cause plants to dry out or develop root rot, givin…