Mint is so easy to grow, you might as well start over. I have peppermint. I use it in drinks all the time--and salads and stuff--and it is fine. I started it from seedlings. It flowers every year. I assumed it was producing seed, but maybe not.

Mints typically spread by the roots, some quite exuberantly, and that's a much easier method of propagation. I believe full sun is also important for concentrating the oils that give it it's distinctive taste.

Mostly I was just passing on the information below, since it really seamed to explain why my spearmint grown from seeds was less than stellar. It's a exerpt from the link I originally posted. I would never have thought of this so I was happy to find that cross at the farmer's market
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Like other herbs that have long been misunderstood by the industry, starting with seeds is a recipe for disappointment.

Although âÂÂpeppermintâ seeds are widely sold by seed companies, the true peppermint, Mentha x piperita, is a sterile hybrid that cannot produce seeds. Artificial crossing of its putative parents is an exercise in futility because any seeds produced by such crosses result in diverse forms, most of which will not possess the characteristic peppermint aroma and flavour.

What is commonly sold as âÂÂpeppermintâ seeds is in fact a rank-smelling form of spearmint (Mentha spicata) which has no value as a kitchen herb.

While commercial spearmint seeds are at least the correct species â» Mentha spicata â» plants grown from them have all the wrong combinations of essential oils, with, again, an undesirable rank smell and flavour.