How many litres of compost do I need for a 12" pot?

sb44

I have 6 x 12" square planters that I need to fill which are also 12" deep.

Can someone please tell me how much compost I would need for each one please?

Ta!

Wig

Strange shape containers.

At a guess I would say about 8 - 10 litres per container.

Depending on what you are growing, you don't need to fill them all the way down, you can put some bricks or polystyrene at the bottom.

gmgmgm

sb44 wrote: »

I have 6 x 12" square planters that I need to fill which are also 12" deep.

Can someone please tell me how much compost I would need for each one please?

Ta!

It sounds as if you're asking about 6 planters which are 12" cubes.

http://www.google.co.uk/search?q=1+cubic+foot+in+litres

gives you 28 litres.

JupObs

sb44 wrote: »

I have 6 x 12" square planters that I need to fill which are also 12" deep.

Can someone please tell me how much compost I would need for each one please?

Ta!

Let's see. There's 1000 litres in 1 cubic metre. Each pot (assuming 12" cube) is 0.3048*0.3048*0.3048m = 0.028 m3.

Therefore each pot has volume of 28 litres.

Regards

Wig

Ah, I see, I thought 6" x 12" by 12" deep.

Ok if 12 inch cube container - not such a strange shape now. You'll be looking at 20 litres per container, because they won't be filled to the top, and you can put a couple of bricks or polystyrene blocks in the bottom to bulk it out a little.

2 x 60 litre bags of compost

sb44

Ok folks, thanks for your help.

They have Miracle Gro on offer in Wilkinsons at the minute, 3 x 56l bags for £12 so off to buy some of those.

Does anyone know where I can buy peat on the high street please?

I have tried and can only find peat free composts.

sb44

Sorry for confusing you with the size of the pots, here they are.

They are actually 15" from rim to rim but 12" planting area.

Wig

sb44 wrote: »

I have tried and can only find peat free composts.

Sounds perfect, peat should be banned. You can use some plant food if you think they need it.

sb44

Wig wrote: »

Sounds perfect, peat should be banned. You can use some plant food if you think they need it.

I think I may use 2/3 miracle gro compost and 1/3 perlite instead, I'm sure it can't make that much difference.

The square foot mixture is based on someone in America using it and of course it's a lot wetter here so I would imagine I don't need to retain as much water as they would over there.

A._Badger

sb44 wrote: »

I think I may use 2/3 miracle gro compost and 1/3 perlite instead, I'm sure it can't make that much difference.

The square foot mixture is based on someone in America using it and of course it's a lot wetter here so I would imagine I don't need to retain as much water as they would over there.

Not true, I'm afraid. A container in the sun will dry-out almost anywhere - and inside a day in Summer. Regular watering is essential when you're gardening in containers.

Photo_Stylus

Wig wrote: »

Sounds perfect, peat should be banned. You can use some plant food if you think they need it.

Why should peat be banned? Which did a test on various brands of compost and none of the peat free cames came close to the peat based ones.