How do plants grow in Minecraft?

je
4

I have Minecraft Windows 10 Edition Bedrock with update 1.15.

I have a problem that my pumpkin is not growing despite the command

/ gamerule randomtickspeed 3000 and the observer (observer) does not forward the change to the piston which then breaks down the pumpkin.

he

Do you have a block of grass where the pumpkin can grow on?

Ti

Is there a free field next to the pumpkin plant? Water nearby?

je

Yes and yes

je

Yes