Epiphyllums, also known as orchid cacti or epiphytic cacti, are houseplants favored for their large, dramatic flowers. Here are some care tips for epiphyllums:

1. **Light:**
- Epiphyllums prefer bright, indirect light. Avoid direct exposure to the sun, especially during the hottest hours of the day.

2. **Temperature:**
- Maintain a constant temperature between 18°C ​​and 24°C. Avoid extreme temperatures and cold drafts.

3. **Watering:**
- Water regularly during the growing period (spring and summer). The soil should remain slightly moist, but avoid water stagnation.
- Reduce watering during the rest period (fall and winter) and allow the substrate to dry out between waterings.

4. **Humidity:**
- Epiphyllums prefer moderate humidity. If the air is dry, spray water around the plant regularly or place a tray of water nearby.

5. **Fertilizer:**
- Fertilize during the growing period with a balanced houseplant fertilizer every 4 to 6 weeks.
- Reduce or stop fertilizer during the rest period.

6. **Soil:**
- Use a well-draining potting mix, generally intended for cacti or succulents.

7. **Support:**
- Since epiphyllums have flat, flexible stems, they may require support. Use stakes or trellis structures to support the stems if necessary.

8. **Size:**
- Prune the stems to maintain the shape of the plant and to remove damaged or weak sections.

9. **Spread:**
- Epiphyllums can be propagated from stem cuttings. Let the cutting dry slightly before planting it in a suitable substrate.

10. **Protection against parasites:**
- Inspect the plant regularly for the presence of pests such as mealybugs or red spiders. Address any problems as they arise.

By following these care tips, you should be able to successfully grow epiphyllums and enjoy their beautiful flowers when they are in full bloom.