Answer: Pavers need to be set in sand/soil (not grouted) so plants can get a toehold in the small spaces between. Start with very young plants (nearly seedling size or as barely rooted cuttings), in early to mid-spring. You can also scatter seeds. These are some possible plants, although your selection will depend on whether the area is in sun or shade and in a sheltered position or not. Moss tends to need cool, shady environs, for example. Thymus praecox (creeping thyme), Lysimachia nummularia (creeping Jenny), Sagina subulata (Irish moss), and Waldsteinia fragarioides (barren strawberries) are all possibilities, as are some of the very dwarf sedums which can be started by "sprigs". When you start applying water, watch for weeds that may have been lurking waiting to germinate and pull them immediately. Good luck!
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