Would this work as a way of keeping soil in a plant pot moist ?

It seems the idea is that if the soil is dry then the roots of the plant would just draw water in from the bottle at the end of the tube.
It seems very simple, how likely is this to work ?

 

Zero in my opinion.
You would be better off with capillary matting and letting the water come up via the drainage holes in the pot.

 

I can't see any way that would work.
Just because to compost dries out it won't suck water out of the bottle - it could only work if the pressure in the compost reduces enough to suck the water through the tube - and I can't see any reason for that to happen.

 

You might siphon all the water out of the bottle onto the bench.

 

No, that won’t work, capillary matting would be better, as @pete says. Also, if that’s being kept as a house plant, it’s better to let the compost dry out between watering to avoid root rot and potential diseases. The pot should also have a clear drainage hole.

 

Oh thats disappointing, i found an internet webpage earlier today that said this should work

 

If you replaced the tubing with a wick @hi2u_uk , that might work. There’s lots of information about this type of watering on line, often used as a temporary measure when on holiday. Have a go with another plant (I wouldn’t want you to sacrifice your Caladium ).

 

That sounds similar to the below. I am using one of these, and it works extremely well, the plant I use it for has never been happier.

 

They look very smart @CostasK, good to know they work .