I have a favourite pair of hand knitted bedsocks that are looking rather worn out under the heels.
The yarn they were knitted from was handspun pure wool, so it was always liable to wear out quite quickly. (If you are going to knit a pair of socks, then use a yarn with a bit of nylon in the content as that won’t wear out so quickly)
Here’s how I darned my socks:
First of all, you’ll need a large sewing needle, some matching yarn and if possible, a darning mushroom. Darning mushrooms are often found in charity shops and many different brands are available online at varying prices. You might use a cup or jam jar instead. Sewing needles that have an eye large enough to sew with yarn are available from craft and at some hardware shops.
First, turn your sock inside out. Sew large running stitches along one side of the worn area and pull the darning yarn through, leaving a short end. Then with your needle facing the opposite way, go back with a row of running stitches parallel to the first row and pull the darning yarn through, but don’t pull it tight. Repeat this making parallel rows up and down across the whole of the worn area, until you get to the other side. It will still look a bit threadbare, but here comes the next bit!
You are now going to sew your running stitches across the worn out area at right angles to your existing stitches (see green arrows on the picture below left). Keep on sewing your parallel lines of running stitches back and forth across the whole area until you have got to the other end of the worn out bit. The area should now be covered with your stitches criss-crossing over the worn-out area. The short end you left at the start can now be snipped off, as can the remaining finished end of your yarn. (I won’t advise tying a knot or oversewing to finish off, as this will leave a lump under the heel of your sock.) Once your darned sock has been washed and worn a couple of times, the darning will blend in with the original knitting.
I have darned here using matching yarn. You may wish to use a contrasting yarn to make a feature out of the mend. There are loads of possibilities to highlight your mending skills. Have a look on You Tube for colourful darning tutorials.