What does thinning out the plants do? If you thin out the plants, the remaining plants will fill out more and produce more seed pods per plant. Brianna Perry2023-03-20T22:30:57+00:00March 17, 2023|Planting and Growing, Poppy Seed General Information| Share This Story, Choose Your Platform! FacebookXRedditLinkedInWhatsAppTumblrPinterestEmail