Tropica is a nursery, they supply plants to your local store. I don't think their website is best at locating dealers, but they are one of the most commonly available in the US. Their plants available in the US are pretty much all grown in Canada.
Other large commercial options in the US are Florida Aquatic Nurseries, Ultum Nature Systems and there are other smaller options too. It really depends on price and the specific plants.
I'm a big proponent of local aquarium clubs, specifically plant related ones. They will likely be able to assist with the growing of them, and be able to tell what the required water parameters are.
The AGA (aquatic gardeners association) has a decent list of clubs, pages, forums and businesses that will be of use to you.
If you say where you are in the US you are, it will make it easier to suggest somewhere to go in person.
Personally, I don't want to introduce any fauna to my aquarium via the flora; some plants may not take well to bring dipped in bleach or potassium permanganate or whatever, depending on how fragile they can be. And it's far easier to not put anything extra into your aquarium than it will be to remove it afterwards. Fish eggs, snail eggs, duckweed, Gibba, parasites can all be transferred via plants.
Other large commercial options in the US are Florida Aquatic Nurseries, Ultum Nature Systems and there are other smaller options too. It really depends on price and the specific plants.
I'm a big proponent of local aquarium clubs, specifically plant related ones. They will likely be able to assist with the growing of them, and be able to tell what the required water parameters are.
The AGA (aquatic gardeners association) has a decent list of clubs, pages, forums and businesses that will be of use to you.
Aquatic Gardeners Association : Aquatic Plant Links
www.aquatic-gardeners.org
If you say where you are in the US you are, it will make it easier to suggest somewhere to go in person.
Personally, I don't want to introduce any fauna to my aquarium via the flora; some plants may not take well to bring dipped in bleach or potassium permanganate or whatever, depending on how fragile they can be. And it's far easier to not put anything extra into your aquarium than it will be to remove it afterwards. Fish eggs, snail eggs, duckweed, Gibba, parasites can all be transferred via plants.