Many lily species, particularly Easter lilies (Lilium longiflorum) and tiger lilies (Lilium lancifolium), are toxic to cats and can cause severe kidney damage if ingested. To ensure your pets’ safety, it’s best to avoid planting these types of lilies if you have cats. Instead, consider pet-safe alternatives like daylilies (Hemerocallis spp.) or other non-toxic plants for your garden.