In the new Path of Exile: Harvest league, the player collects and plants seeds for rewards. I find myself constantly out of "wild" (purple) seeds. Is there a way I can get more to drop - particular monster types for example?
For tier 1, no, it's random. For later tiers, they drop of the same color as the tier 1 garden you harvested.
And don't worry too much about needing a specific seed, that need will shift as you get new gear to socket/link/reroll. Item level limits will hurt more in the short term, and in the medium term you'll have everything you need, especially once you start manufacturing T3 seeds.