What to read after Garden-Craft Old and New?

"Let us here point to the fact, that any garden whatsoever is but Nature idealized, pastoral scenery rendered in a fanciful manner. It matters not what the date, size, or style of the garden, it represents an idealization of Nature. Real nature exists outside the artist and apart from him. The Ideal is that which the artist conceives to be an interpretation of the outside objects, or that which he adds to the objects. The garden gives imaginative form to emotions the natural objects have awakened in man." Garden-Craft Old and New is a guidebook on gardening by enthusiast John D Sending, deceased by the time of its publication.