Usually in a rock garden when the lower leaves turn yellow it means that it needs a bit more on the watering. Low air humidity(dryness) can also cause them to get a bit on the dry side prematurely.When my moms take to looking a bit yellowish I increase the watering accordingly. And you'll notice in the budding room that as the plant(s) progress into buds they start using way more water from the res. I top the res up daily with an electric valve and a timer and a water level cut off sensor...things you can prepare for and add as you go. So up to about week three you can get away with switching the res every seven days but after that you'll have to swap it out more regularly and towards the end you might find you'll have to do it every four days. I feed my moms with the spent water from the budders. That way I can't screw up on the mom(s).
