Johnny, I have to confess that for the first time ever, I didn't sow seed this year as my father in law died and we had to clear his house and I was walking his dog. So at the end of April I looked for
Matucana or Cupani (these have the strongest scent) plug plants. Sarah Raven had a sale, a week later I had 36 plants including Venetian heritage mix. Watered well, planted in a big container and prepared ground. Melcourt SylvaGrow peat free multi-purpose with added John Innes. Watered with tap-water. You want to grow them up a support, pea sticks or roughened canes. Tie the plants in with raffia or twine. Mine came with the tips pinched out already so they bush out. This is the easy, but expensive way. You can get much cheaper plants from most garden centres but not usually the heritage varieties.