I can’t keep myself from sowing, although it is still a bit early. With Verbena bonariensis (tall vervain) I am willing to take my chances. It must be considered a perennial in many places, but it is not here, on the heavy clay. It simply disappears. They sow themselves between the cracks of the paving but I have never been able to move them alive.
They like loose, light soil and that is why I sow them in sand mixed with potting soil. I do not actually buy seeding soil, I use old potting soil that has been used for a season, mixed with sand. I know that it is not advised by many people because of the risk of viruses and fungi, but it usually works out fine here. I add a little extra sand for Verbena bonariensis, because it especially likes light soil.
I love Verbena bonariensis: their loose, almost see through presence in the garden en the electric purplish flowers that attracts so many insects. I have heard they are easy to take cuttings from as well in late Summer. I will have to give that a try if I manage to grow these.