All the mints are agressive. If you want to have it in the ground use a root barrier and then some kind of edging that will help you to keep the runners in place as well. I will say that my pineapple mint isn't as vigorous as the spearamint. But then I'm in zone 7 working with clay soil. Your conditions are probably very very different.

Peonies actually like cooler climates than mine but I still have 5 in my garden and would happily make room for many many more. They can take a long time to establish themselves (around 3 years in the average) But they live around 75 to 100 years and increase the size of their clump every year. The flowers don't bloom for very long a week or two at best but they make the greatest cut flowers. Second only to roses in my opinion. So if you have a protected (from the wind) sunny place about 3 foot square I would definitely plant one. They come in a variety of Whites, Pinks, Reds, a few purples and even some oranges.

I would also have a mock orange if you have any type of arbor or tall fence that it can rest on. They grow from canes and I like them more upright so I like to see them supported. But if you like the weeping willow type shape you can just give them lots and lots of room because the canes do get quite tall. The smell is outstanding and I like them in cut flower arrangements.

I love my crocuses, daffs, and tulips for early spring color, my roses bloom right after that and you can buy the subzero roses so that they will come back.

Those are just a few suggestions. I'm sure others will chime in with their favorites.

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kurlie, what zone are you in? without your zone, it's hard to suggest. also, what is the area like? sunny or shady? and do you prefer flowers or bushes?

the daisy should be okay if you move it...just make sure to take a really good chunk of the soil too, so that you don't disturb the roots too much and make sure you water it well until it's re-established.

the peony may or may not bloom...they can take a few years to get established.

mint is very invasive. if you put it in the ground, put it in plastic pots and then put them in the ground...over time, tho, even that won't keep the mint in check.

do you have a spot that is surrounded by concrete? that would be the best place for the mint unless you don't care about pulling it up regularly all summer long to keep it somewhat in check.

I have lemon mint growing all over, even into my lawn.
I didn't plant it. It was planted by the previous owners, probably not in a pot.
My advice to you.... Plant in a pot.
Tammy