Gardening in the urban jungle

This week we're gardening on barges, balconies and in bathrooms in a programme dedicated to urban gardening. Writer Alice Vincent dispenses tips on plants, pots and more from her London balcony garden 40ft above the ground. Freddie Blackett of Patch Plants talks about the changing ways we're buying and using houseplants, and permaculture designer Poppy Okotcha shares her experiences gardening on a houseboat in the heart of the city.