I've tried trailing lantana (lantana montevidensis); my notes say I sowed the seed in early April and had germination in mid May (probably could have done them earlier). I didn't do anything special to the seeds.

Unfortunately, they did not bloom for me before frost got them, although they grew lots of really pretty foliage. I think perhaps starting the seed a bit earlier - at least early March - might have given the plants more time to produce flowers.

I didn't try to overwinter them.

HTH -

PV

I sowed mine in February two years ago. They germinated very late and barely bloomed even in my zone. It likes lots of heat and sun. If you do get them to germinate, try planting them next to a brick wall on the southern side.