Caring for a Mammillaria Perez De La Rosa, like other Mammillaria cacti, involves some general principles for cactus care. Here are some guidelines:

1. Light: Provide bright, indirect sunlight. Mammillaria cacti generally thrive in full sunlight, but too much intense sunlight can lead to sunburn. If you’re growing them indoors, place them near a south or west-facing window.
2. Watering: Allow the soil to dry out completely between waterings. Overwatering is a common issue with cacti, so make sure the soil is dry before adding more water. Water sparingly during the dormant winter months.
3. Soil: Use a well-draining cactus mix or create your own mix with sand, perlite, and potting soil. Good drainage is crucial to prevent root rot.
4. Temperature: Mammillaria cacti prefer warm temperatures. They can tolerate cooler temperatures in the winter but should be protected from frost.
5. Potting: Repot when necessary, typically every 2-3 years. Choose a slightly larger pot with good drainage. Repotting is usually done in spring or early summer.
6. Fertilization: Fertilize during the growing season (spring and summer) with a balanced cactus fertilizer. Reduce or eliminate fertilizer during the dormant season.
7. Pest Control: Keep an eye out for pests like spider mites and scale insects. If you notice any infestations, treat them promptly with insecticidal soap or neem oil.

Remember that specific care requirements can vary slightly depending on the exact species or cultivar of Mammillaria Perez De La Rosa, so it’s always a good idea to research any unique needs it may have. Additionally, observe your cactus regularly to adjust care based on its individual characteristics and environmental conditions.