Lupines revert to pink

I have very healthy lupines. However, I have set pink yellow and blue/white dwarf. They all thrive but all change to pink after a few years. What do I do for new plants to sustain their color? This year I have loads of pink lupines and 1 yellow and one pale blue left. Why? Do I have to add something to the soil?

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1 Comment To "Lupines revert to pink"

#1 Comment By Downtoearthdigs On 07/06/2015 @ 11:43 pm

Color change in mature lupines is normal. Oftentimes, lupine flowers change color when they have been pollinated. In addition, existing soil conditions and cross-pollination can cause colors to fade and change from the original over time, with hybrid types even reverting back to the original color from which the plant initially derived.

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