For trees, we have Fertilidust to grow them and restore their produce, with the lite version only doing one tree and the big version doing all. For animals, we have Fecundity Powder to make animals drop their goods, with two tiers determining the amount they drop.
For gardens, how about a Fountain Spray Powder? Using Grendalinunin (because Grendaline is the Giant for water of course), you could create this powder that, if used in front of a garden, will water all plots on that garden simultaneously. If creating a 'lite' and 'heavy' version of it, like the others, you could have one only partially water all the plots and the heavy one water them fully. The heavy version could be called Rainmaker Powder. =p
Because Grendalinunin uses so much red element, it may actually make mining Beryl more useful for a lot more players than it currently is.