catnip makes a pretty decent tea...very calming

Any fruits such as apples, quince, blueberry, raspberry and so on can be dried and added to tea. Fresh too, for that matter.

Rosehips are nice....roses were in all the old herb gardens of yore.

Lemon balm, sage, dandelion (leaf & root), raspberry leaf, nettle... to add to what has already been said.

Herbs have medicinal actions too. If you plan on drinking more than the rare occasional cup of something, be sure to check to see what effects the herb has.

FataMorgana

I don't grow, but I harvest and dry the wild Goldenrod around here for a medicinal tea(for urinary complaints,not that you wanted to know that,LOL), but it also tastes good.
I do grow Chocolate Mint and Lemon Balm and still have some dried Lemon Verbena that I grew a couple of years ago. I need to grow more of that!

I have regular lemon balm in my garden, but this spring I bought
some lemon balm seeds from Johnny's Seeds. These are suppose
to have more essential oils than regular lemon balm. Ohh boy, it
smells so much stronger than common lemon balm. It makes a
stronger tea with less leaves. I just love to brush my hands against
the leaves, and my hands smell lemony. I also make tea from Anise
Hyssop. Rosemary tea is also good for memory problems.

Ceanothus americanus is supposed to make a good tea, and many cooking herbs can be used for tea. I picked Persimmon leaves at the end of the season for tea, and stinging nettle. You might want to look at an extensive list with uses and cautions on the Plants for a Future database.

Here is a link that might be useful: pfaf tea