Problems with bathroom stationery centres!

I have used the cardboard rolls from the middle of loo paper for peas, beans and parsley seeds for years. My daughter, has followed suit now she has a garden.
Last year and this the seeds germinated but the plants have not thrived (accept the heat may be a problem) for either of us. The seeds I sowed in plastic cups are great. I have always kept the cardboard damp as it dries out quite quickly.
The plants from the plastic cups - great
The plants removed from the loo rolls - recovering
The plants planted in the loo rolls - dying
I can only imagine there is now something in the manufacture that makes them unsuitable? Has anyone else noticed this?
Last year and this the seeds germinated but the plants have not thrived (accept the heat may be a problem) for either of us. The seeds I sowed in plastic cups are great. I have always kept the cardboard damp as it dries out quite quickly.
The plants from the plastic cups - great
The plants removed from the loo rolls - recovering
The plants planted in the loo rolls - dying
I can only imagine there is now something in the manufacture that makes them unsuitable? Has anyone else noticed this?
"The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it." Sir Terry Pratchett
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This years crop is doing fine, pods are swelling nicely 😋. The whole thing gets planted out, burying the tubes underground to rot away.
Could it be brand specific maybe? I don't know.
I buy "Nicky"🚽
Well Fire, have you changed brands? Its a mystery
I feel an experiment coming on, have to go buy some other bathroom stationery and sow seed under controlled conditions. Oh dear, that's going to be really hard
it started as a family joke, a comment from one of my daughters, and has persisted as these things do.............