Broadleaf plantain (Plantago major) is often more associated with outdoor environments, but it can indeed be grown indoors with the right conditions. Here are some insights on your questions:
Thriving Indoors & Potting Mix: Broadleaf plantain can grow indoors, but it requires attention to simulate its natural conditions. Use a well-draining potting mix—something sandy or loamy would be ideal. You might find adding a bit of compost helps mimic the nutrient-rich soils it often thrives in naturally.
Light, Temperature, and Humidity: Broadleaf plantain prefers bright, indirect light. If possible, place your pot in a spot where it receives some sunlight for part of the day. As for temperature, it does well in average home temperatures, around 60-75°F (15-24°C), and doesn't require extraordinarily high humidity. Just make sure to keep it away from drafty areas or extreme temperature fluctuations.
Care Tips & Pests: It's pretty low-maintenance in terms of watering—just ensure the soil remains moist but not waterlogged. Watch out for common pests like aphids or spider mites, which can be managed with insecticidal soap or neem oil. As for diseases, root rot can be a problem if overwatered, so make sure your pot has good drainage.
Medicinal Uses and Safety: Broadleaf plantain is known for its medicinal properties. However, when using it for teas or salves, ensure it hasn't been exposed to any chemicals or pollutants indoors. Wash the leaves thoroughly. For teas, you can steep the fresh or dried leaves in boiling water. For salves, the leaves can be infused in oil and mixed with beeswax to create a topical application. Always do a patch test to ensure there’s no allergic reaction.
Broadleaf plantain is quite versatile, and having a fresh supply indoors can be both beneficial and satisfying. Have you considered other plants with similar benefits, or do you have a specific use in mind for the broadleaf plantain?