What's the best way to prevent leaf drop in my indoor begonias?

Hello there! I'm glad to hear you're enjoying your indoor begonias; they can be such lovely plants! Leaf drop can indeed be a bit stressful, but it's great that you're keen on figuring out the root cause. Let’s unpack this together.

Firstly, it sounds like you've already checked off some key boxes—stable temperature and proper watering are critical for begonias. However, you rightly suspect that humidity could be a factor, especially in an indoor environment like Oslo, where central heating can often lead to drier air, particularly during the winter months. Begonias thrive in higher humidity levels, typically ranging from 40% to 60%. Low humidity can cause leaf drop, browning edges, and overall stress on the plant.

Here are several practical strategies you can implement to boost humidity around your begonias:

1. **Misting**: Lightly misting the leaves can provide a temporary boost in humidity. However, be cautious not to overdo it, as excessive moisture on the leaves can lead to fungal issues. A light misting once a day or every other day can be beneficial, especially if you're in a particularly dry environment.

2. **Humidity Trays**: Placing a humidity tray filled with water and pebbles underneath your begonias can create a microenvironment with increased humidity. Just ensure that the pots themselves are not sitting directly in the water, as this could lead to root rot. The water will slowly evaporate, naturally raising the humidity around your plants.

3. **Grouping Plants**: If you have multiple indoor plants, consider grouping them together. The collective transpiration from the leaves can create a more humid microclimate, which can help all your plants thrive.

4. **Humidity Monitors**: Investing in a hygrometer can give you a precise reading of the humidity levels in your space. This can help you make informed decisions about when to mist or adjust your humidity tray.

5. **Use a Humidifier**: If you find that your indoor environment is consistently dry, especially in winter, a small humidifier can be a great long-term solution. This will not only benefit your begonias but also any other tropical plants you may have.

Now, aside from humidity, consider other factors that could be causing your begonias to drop leaves:

- **Light Conditions**: While you mentioned that the light is decent, ensure that your begonias are getting bright, indirect light. Too much direct sunlight can scorch leaves, while too little

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