What has the author Rob Herwig written?

Rob Herwig has written:

'128 houseplants you can grow' -- subject(s): Accessible book, House plants

'The edible garden' -- subject(s): Edible Plants, Gardening, Plants, Edible

'The Hamlyn encyclopedia of house plants' -- subject(s): Dictionaries, House plants

'350 trees, shrubs and conifers in full colour' -- subject(s): Dictionaries, Shrubs, Trees

'The Hamlyn dictionary of house and garden plants' -- subject(s): Dictionaries, Gardening, House plants, Ornamental Plants, Plants, Ornamental