My leafy plants are losing quite a lot of their leaves lately. I think it's the period of their regrowth.
こんにちは！
ご質問ありがとうございます。
"My leafy plants are losing quite a lot of their leaves lately."＝「私の観葉植物は最近、かなりの葉を落としています。」
（☆「観葉植物」の別名には"foliage plant"があります。）
"I think it's the period of their regrowth."＝「これは生え変わりの時期だと思います。」
ご参考に。
アメリカ合衆国 
