tigersprout writes:

Hi, I'm new to the forum and am perhaps being a little lazy really by
not searching for previous posts to help with my problem.
I thought that by asking afresh as it were it might kick start my
experience.
I have moved into a house in the midlands and the back garden hasn't
been touched in 25 years apart from being strimmed.
Upon clearing the rubbish, I found a 4" carpet of squitch/horse hair I
think it is and upon closer inspection, the roots run through out the
top soil.
I have usually dug strands out before but the expanse of root system has
to be seen to be believed. The garden is overrun. I could get the top
soil removed but this in itself and the replacement would be expensive.
A systemic weed killer perhaps?? But I hesitate as I wanted to grow on
the soil this year. Help anyone?

Not a very good description.

What's a squitch? The urban dictionary has 3 entries but they don't
seem to apply.

The only root system I've ever seen that looked like horse hair was
Weeping Willow. That will form huge mats if the soil is waterlogged.

Regular weeds you can kill with Round Up and plant right after the
plants die.