I planted a 4" nursery pot of a pink and yellow lantana in a friend's garden over a wall where the soil was soft and fluffy - great drainage and sun. Last year when I did this, I sowed sweet alyssum 'Magic Circle' around it and throughout that area. The blooms were glorious, the alyssum perfumed the area, and no critters bothered the plants - except, one by one on some mornings, the purple alyssums would disappear until only white alyssum remained. What might have done that? not a problem as I was so thrilled to actually have flowers and fragrance in that garden - but what pest goes after purple?
This year, I did not sow the alyssum and seedlings disappeared, except for one in the crack of masonry below between the bottom of the masonry and a paver - it's thriving and bushy with white fragrant flowers.
As for growing the same lantana in that garden again this year, but across an aisle further back from the wall and with same great conditions of sun and drainage, only one or two blooms appeared on the lantana this year.
Perhaps a clue might appear if I describe the general behavior of this garden, but I'll stop here and keep the topic on this lantana.
On another note, regarding Lantana montevidensis, a trailing, purple lantana species, I'd just like to mention a few years long ago in my own garden, when we planted it in a partly shaded clearing. It and a few of its rooted cuttings grew to entirely fill the 15'x15'? space and I loved its delicate tracery over the flag stones, while being such a tuffy at the same time. But it's not called the Pole Cat Lantana for nothing - the stench was too fascinating to be noxious, and when I began pulling it that fall, a vulture flew above while I yanked, and then another vulture until a parade of vultures was streaming overhead and it went on peripatetically for days. That has got to be one of the most impressive bird/plant relationships I have ever witnessed at home.
I'm from the other website, but haven't posted here before - thank you for keeping a Mid Atlantic forum going.
karen