The seeds I grew took 4 years to produce a plant big enough to flower, but well Worth it 'cos you never know what colour you are going to get, I had more success with the plants I put in long toms, so the roots must like more space, they flowered first, and looked better plants. Sow the seed as it emerges, and it nearly all germinates. Potting up the self sown plants worked too. And at £8.00 each for the fancy ones it's worth it.
Brian