Hello!
Here where I live water is really hard, there's a lot of limescale, we have a pitcher with limecale filters for drinking; but it's too small to filter water for watering my daylilies.
So I water them with no filtered water, and I can see a lot of white signs on leaves, left by limescale. Is it a problem or not?

Thank you!

Some daylilies don't like the media pH to be too high but if they're not happy they will tell you by developing interveinal chlorosis like this:

http://www.daylilies.org/ahs_d...

Not every daylily cultivar is as fussy about the pH though.

Are you able to catch rainwater for them instead?

Thank you! I'm not seeing anything like interveinal chlorosis, I'll check better tomorrow in the morning now that I know what to look for.
I don't have any chance to catch rainwater, it's not raining. The past summer was fresh and rainy, this is hot and dry.