These flowers might have thorns. You better not touch them. They might make you itchy.
These flowers are prickly. You shouldn't touch them. It might irritate your skin.
1) These flowers might have thorns. You better not touch them. They might make you itchy.
「花に棘があるかも。触らないほうがいいよ。痒くなっちゃうかも。」
thorn で「棘」
make 人 itchy で「痒くなる」
2) These flowers are prickly. You shouldn't touch them. It might irritate your skin.
「この花はチクチクするね。触らないほうがいいよ。皮膚が痒くなっちゃうかも。」
prickly で「棘だらけ・チクチクいたむ」
irritate で「(皮膚などを)刺激する・ヒリヒリさせる」
ご参考になれば幸いです!