Can you put mulch such as grass cuttings underneath weed control fabric?

I bought weed control fabric for putting at the base of my new hedging plants which I will be planting shortly. It’s quite a long area. But the fabric is very thin and I don’t think it will fully stop the weeds growing as you can see light through it. I can’t afford to buy better fabric so I was thinking of way to add a layer of something under it ….ohhhhh I just had an idea as I was typing this out ….cardboard? I have loads of cardboard. Could I put that under the fabric? Can’t put it on top as I’m a very exposed area in Scotland and it would blow away instantly.
Thanks

 

You can put cardboard underneath. It will kill weeds and stop them germinating but only for about a year but with the weed fabric as well it should last longer.

 

Great thanks.

 

Awesome thanks. Could I use seaweed and grass cuttings too if I run out of cardboard?

 

I would be inclined to put them on top as a mulch. If you put them unrotted under the fabric they will heat up too much while they rot down.

 

I might get away with as I live in Shetland, it rarely gets hot here. Thanks for the warning though

 

Ok. Thanks for your response and apologies for delay in reading it

 

Layers of material is always a better method - so the seaweed/grass, plus some cardboard [which will also rot down] but then add a layer of rotted manure, or something similar - like hefty soil, on top instead of weed fabric, and that will be far better. Soak the soil thoroughly first, add those, and soak again, and it should stay in place quite well. You'd still need to water well for the next few months anyway, regardless of conditions, because the wind will dry everything out - including the whips. It isn't the best time of year to plant hedging, for that reason.
Wind is every bit as drying as full sun, and there has to be really good persistent rain for it to get into the base of a new hedge, especially if any of it is evergreen, or if it's densely planted, which I expect it is, due to the location. A man made shelter/screen [which I think you were doing?] will also be needed to filter the worst of the wind until the hedge establishes and starts growing.
Once autumn arrives, it should be fine, but it's always about vigilance with any new plant in exposed conditions.

 

That’s suuuuper helpful, thank you!