[nuttytart]

As the subject really?!!!

[Springlands]

Is there a particular reason that you want/need to do so - this may help with the answers

[peapod]

I havent heard of that before myself - chicken wire for moles, but not bin bags in a GH bed. Is it for retaining moisture?

[8doubles]

They will be a pain in the butt to dig out later, something thicker like a compost bag or rubble sack would be better.

I used the polythene bag from a new mattress for the runner bean trench which lasted two years.

[DavidT]

Basically, no. May I ask why you are putting in a trench in the greenhouse? Soil needs to " breath", polythene will inhibit that function.

[nuttytart]

basically, i have a 'new' greenhouse, my garden is all clay, so where i have put it on the grass, other half has dug out a trench inside it to grow things, but because of the clay, i dont want it taking all the water and good ness from my plants. So something like a sack or rubble sack would work? and its a rented house and i dont want to spend the time making the soil all nice for me to move out and not be able to use it!
Does that make sense?!

[8doubles]

I use compost sacks to line trenches in the greenhouse poke the garden fork through a few time to get some drainage and fill with sharp sand . Into this go bottomless buckets full of compost for the tomato plants.

This system has worked well for years.

[DavidT]

As long as it`s not  "blue ", clay is the best soil you can have. It is jampacked with nutrients, so use it, not abuse it.

[nuttytart]

Thankyou!
does it hae to be sand?!
i wanted to this as cheap as possible, could i use something else, these a bag of broken tiles in the garden, could i use them?!

[nuttytart]

it's sticky, slimey horrible orange clay. theres massive cracks appearing down the garden where its so dry, the garden is also sliding under the fence into the road....

[peapod]

Can you get hold of some manure and sand (pretty cheap from builders merchants - about £35 a ton) to dig in over the winter? It'll make a huge difference

[8doubles]

Thankyou!
does it hae to be sand?!
i wanted to this as cheap as possible, could i use something else, these a bag of broken tiles in the garden, could i use them?!

It needs to be something the plants can get their roots into to use the nutrients the polythene is holding in. You can normally get some good deals on compost about now.

[savbo]

you might be able to get some municipal compost made from green waste for little or no cost...

[nuttytart]

i dont want to prepare the soil, i want 'ready to use' as i am moving out this time next year and dont want to be disturbing plants that are producing! will have a go with the liner and compost thingys!
thankyou!

[DavidT]

Dig the clay over, and plant in it. Simples.