Luscious, large leaves of alocasias, the paddle-like leaves of heliconias, and the varied shapes of philodendrons create textural layers and along the paths smaller plants such as selaginella and aluminium plants colonise the edges. Summer brings torrential downfalls, which, if not too severe, nourish the garden and make the foliage lustrous, but nutrient leaching can be a problem, which is why Mark adds plenty of complete fertiliser, particularly Nitrophoska Special, and mulches regularly w…