Download or read book Penstemons written by Robert Nold and published by Timber Press (OR). This book was released on 1999 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt: With some 270 species, penstemons are particularly beloved by rock gardeners. The author has grown most of the species, and this work abounds in useful cultural information based on experience. It also features watercolours and photographs.'