Answer: Russian sage is generally disease free so I'd look first to the growing conditions; average but well draining soil and lots of sun. Soggy soil, rich soil, or not enough sunshine can cause weak growth; too much nitrogen will cause lots of excessively weak stems. Since it's early in the season, why not cut the spindly stems back to healthy wood and let your plant start all over again with brand new growth?
Best wishes with your garden!
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