Source: https://www.dndbeyond.com/posts/1488-the-horticulturists-guide-to-plants-in-d-d

While securing the Mazeelder HQ the party found the greenhouse in complete disarray. Most of the plants were dead or overtaken by the hardier species. Persephone found an herbalism kit and a list of all the plants that used to be in here (see the Homebrew Plants for Your Game). There is equipment and instructions for making any of the listed potions, however all of the ingredients are gone. In order to find more, ask the DM or use the 'Finding and Identifying Plants' section of the above rules.

In order to brew the above potion a PC needs to have a full free day

The current plants in the greenhouse include