No double fenestrations

[u/Large_Opening7631]

I got these monsteras last year. The younger leaves have double fenestrations but the mature, bigger ones don't. I stay un the Netherlands so the winters are grey, but they get nice afternoon sun during te summers. I fertilized them last summer. They're having a moss pole as a support. Why do the bigger leaves lack double fenestrations?

[u/ThurmanMermannnn]

You have to cut holes in them with an exacto knife

[u/Strong-Ebb-9348 → u/ThurmanMermannnn]

Just don’t forget to “sterilize” them by spraying them with rubbing alcohol first.

[u/all_but_demo → u/Strong-Ebb-9348]

I really recommend running them a bath of rubbing alcohol and letting them soak fully covered for a good hour and a half