I have 83 Agastache I planted last year. In the next few days, the temperature could go below 32 degrees. Can they survive a short freeze? Talking hours - or will they need to be covered??
Your plants should be just fine in temperatures at or below freezing.
Agasthache are hardy down to 10 degrees F.
My 2 plants grow very tall. They become topheavy and then fall all over the place. Looks very sloppy. How can I avoid this?
These can benefit from some light pruning and deadheading, to control their shape and size. It could also be that they are lacking light if they are in a shaded area, or if an area seems to get too dry.
Here is an article to help you with their care: https://www.gardeningknowhow.com/edible/herbs/hyssop/cutting-back-anise-hyssop.htm
My plants are potted. Is there things I need to do to help them survive the winter or do they go dormant??
This depends on where you are located. The plants are hardy in zones 4 through 10. Outside of these zones it will need some extra care. Within these bounds, the plants will do just fine on their own. Here is an article for more information on the care of these plants: https://www.gardeningknowhow.com/ornamental/flowers/plumeria/plumeria-pruning-info.htm
What size pot recommended for planting agastache plants?
Generally, a five to 8 gallon container will suffice. This will give it plenty of room to grow, while not being overbearing to move if necessary.
I'm saving seed from my Blue Fortune plants and wondering if I'll be able to grow plants from seed. Will I get the same plant, a different plant, or is the variety sterile? Thanks
You will probably get a hybrid. In order to obtain true seeds, there must not be any insects, or bees to pollinate with any other variety that is around.
Usually, this can be done indoors, where the only plant in the area will be your target species
You can still plant your seeds, and expect a plant that has its own, unique look to it, though.
This article will offer more information on the plant: https://www.gardeningknowhow.com/edible/herbs/hyssop/growing-agastache.htm
I'm in British Columbia ( Vancouver ) The patio is facing west and gets full sun. The pots are well-drained with a large saucer to contain drainage. They are protected by a standard height clear glass enclosure.
You could get a perennial agastache in that color. But you might have hummingbirds and butterflies trying to land through the glass. Something like a tall cacti/succulent would look nice.
These articles should help: