Russian Sage - yellowing leaves???

I live in the Denver area and just planted a Russian Sage that's about 18" tall, bought from Home Depot.
I planted it in full sun ( about 5 hours a day of it? ) on a slope with good drainage and just checked the soil with a water meter and it's moist but not too wet.
The problem is, in the 5 days since planting, the leaves are starting to yellow from the base upwards. What did I do wrong, or what do I need to do to help this plant make it?
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Did you forget to do the fertility dance?

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Cereus, I was going to tell her how to do it but I like it better when you do.
Callen in VA

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Generally, yellowing foliage on Perovskia indicates TOO much water. This is a very droughty plant and requires little if any irrigation after establishment. I am surprised that planting on a slope is creating this effect - typically sloped plantings have very good drainage. Are you watering it often? If so, I'd cut back a bit and let things dry out.
pam - gardengal

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Not that much but there's a water ditch behind in so it is moist. I guess as it establishes rooting, it might get better.
I thought it might need iron because of the clay soil but they grow all over town just fine.
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There is not really any relation between clay soil and Iron deficiency, as this is only affected by pH. I agree with pam, it sounds like too much water.
Toad
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