For the flower pot and soil, I used a double wire. Just one piece of Hobbii Rainbow Cotton 4/8 yarn with 2 ends (the one from the inside and the one on the outside) combined. I used hook size 4mm for the double thread, 2.5mm for single thread pieces.

You can also use the 8/8, which will make the same result in size/weight, etc. But if you only have 4/8 laying around, using it double wired will give the effect of the 8/8 single wire.

If you use a single 4/8 all the way through, the project becomes half the size that I wrote down on the left of every project. Just that you know :)