We examined the properties of materials for a combination of reflective film mulching and shading treatments in carnation cultivation at high temperatures. We concluded that 2 properties of shading materials were important: one is the transmittance and the other is the rate of diffused solar radiation to the total transmitted light. Appropriate transmission percentage during summer ranged from 40 to 70%. In addition, light diffusiveness of shading materials exhibited an interactive effect on carnation growth. Shading materials with a lower transmittance around 40% required a higher light diffuseness of more than 70% to be effective. On the contrary for a relatively moderate shading of about 70% transmittance, the light diffusiveness did not affect appreciably the acceleration of early growth and flowering. Mulching materials were consistently effective when they reflected more than 80% of radiation. All the combinations of mulching and shading materials with the characteristics described above enabled to obtain yields 20 to 50% higher than in the non-shaded and non-mulched plots consistently over 3 years for 3 cultivars.