VOR is right. That is not a proper filter. The leaf color in the sun should be white with a high wavelength IR filter and pinkish with a lower wavelength filter. I've used 720nm and get white leaf color.
Shoot raw and convert to "the look" by changing the color temp during conversion in your normal photo editor. Use a tripod. You need to focus and then "back off" a bit. The older lenses have a red dot for IR focus. Look at one and you will understand.
Normal IR
Swap channel IR
These are from a converted K10. I've used a K10, K20, and film RF cameras with a 720 filter and get results like those pictures.