What makes the plants grow? Contrary to popular murderhobo belief, it is not "blood, blood, blood!" It is in fact a combination of light, water and nutrient rich soil.
If you can combine these elements, you can develop SOME kind of plants to target with Plant Growth. Any spells then that create or summon these necessities would work. It is debatable if Continual Light generates enough light to raise plants from, but there's one possibility right there. For water, a simple Create Water spell set up as a "trap," by which I mean a self-resetting device, triggered by the growth of plant material, that then showers a small area every 24 hours w/water. For soil, a permanent Unseen Servant that you can command to dig and carry local soil from an exterior source or perhaps permanent gates to the Plane of Earth depending on your power level.
Is this the kind of thing you're looking for?
