This mint, rather than spearmint, gives the authentic mojito taste. Mojito Mint has a much milder flavor with hints of citrus whereas spearmint is much stronger (think breath mints or chewing gum). Mojito Mint has large leaves which make it great for muddling.
It grows to approximately 2′ tall & spreads to 2-3′. Mint, in general, has a strong & vigorous root system so you want to give it plenty of room.
Summary from: www.joyusgarden.com