Posted: 25/08/2013 at 10:48
Mine have done quite well this year and have made some much needed large (4') plants in my new beds while all the new shrubs & perennials are so small.
I sowed mine outdoors quite late (mid April I think), pinched them out a couple of times and didn't plant them out until late June. Some have been flowering well for a few weeks while a few are still in bud. I deliberately grew them this way so that they would flower later after a lot of the early - mid summer stuff has gone over.
Perhaps some of the problems people are having are with earlier sowings which may have been blighted with the prolonged cold start we had this year? The weather generally may also not have helped earlier, larger plants. Very hot and very dry then heavy rain for some. We have had some rain here but not loads & I am still watering newly planted beds on a regular basis.
On the subject of seed collecting (gardeningfanatic) - do cosmos come true from seed? I have a couple of plants which have produced particularly attractive colours or shaded petals this year - so I wondered if it was worth collecting their seed?