Various plants including those normally found in cold climates such as buckbean (Menyanthes trifoliata) and rannoch-rush (Scheuchzeria palustris), those that are grown wild in various regions such as water shields, carnivorous plants such as Utricularia japonica and roundleaf sundew (Drosera rotundifolia), and constituents of high moors such as Moliniopsis japonica (Hack.) Hayata and イヌノハナゴケ are coexisting in Midoroga-ike Pond.
ミツガシワやホロムイソウのような寒冷地に分布する植物や、ジュンサイのような各地に自生するような植物、タヌキモやモウセンゴケのような食虫植物、ヌマガヤやイヌノハナゴケといった高層湿原の構成種など、様々な植物が共存している。