These love poems seem all to have been written in his old age; and that passion causes him thus to open his first book:--"Love was the inventor, and is still the maintainer, of every noble science. It is chiefly that which hath made my flowers and trees to flourish, though planted in a barren desert, and hath brought me to the knowledge I now have in plants and planting; for indeed it is impossible for any man to have any considerable collection of plants to prosper, unless he love them: for neither the goodness of the soil, nor the advantage of the situation, will do it, without the master's affection; it is that which renders them strong and vigorous; without which they will languish and decay through neglect, and soon cease to do him service. I have seen many gardens of the new model, in the hands of unskilful persons, with good walls, walks and grass-plots; but in the most essential adornments so deficient, that a green meadow is a more delightful object; there nature alone, without the aid of art, spreads her verdant carpets, spontaneously embroidered with many pretty plants and pleasing flowers, far more inviting than such an immured nothing. And as noble fountains, grottoes, statues, &c. are excellent ornaments and marks of magnificence, so all such dead works in gardens, ill done, are little better than blocks in the way to intercept the sight, but not at all to satisfy the understanding. A choice collection of living beauties, rare plants, flowers and fruits, are indeed the wealth, glory, and delight of a garden." He seems enamoured with tulips. He describes no less than one hundred and ninety different sorts. He calls them "Flora's choicest jewels, and the most glorious ornaments of the best gardens. Such is their rarity and excellence, and so numerous are the varieties, that it is not possible any one person in the world should be able to express, or comprehend the half of them, every new spring discovering many new diversities never before observed, either arising from the seeds of some choice kinds, the altering of off-sets, or by the busy and secret working of nature upon several self-colours, in different soils and situations, together with the help of art."[34] Switzer says, "the practical and plain method in which he has delivered his precepts, are admirable." There is a second edition of the Flora, _with additions_. What these are, I know not; unless they are the cuts of parterres, which were omitted in the first edition. There is an edition in 1696.