I'm still fairly new at this, but here's my two thoughts:

-the original first leaves often turn yellow/brown and drop off of plants and that is normal...they would be the lowest leaves on a stem. do the other leaves seem green and healthy?

-other leaves yellowing could mean too much water, not enough sun.

What do others think?

bartles

Gazanias are low-water consumers, and I'd bet they have too much water, which can certainly weaken and yellow them.

Why don't you hold off on the watering them until the soil is nearly dry (recommended for adult plants) and as purple says, give them plenty of light. Also Google gazanias and water for more information on their cultivation needs. They're great flowers for dry spots.

I would guess that you are overwatering the tomatoes. How often do you water the tomatoes? Do you let the soil dry out at any times?

I do water too much I think. I water every other day. I think now I will water tomatoes when they look thirsty. The lowest leaves are a little yellow, but the higher leaves are ok.