There is alot of debate about what exactly blue is. Many flowers that are referred to as "blue" are, to my eye, anyway, definitely purple. That could be one explanation.

Another explanation could be the differences in light conditions in different parts of your garden or at different seasons of the year. Blues can look purple in dimmer light, and almost pink or white in very intense light. Sometimes when I see pictures of flowers growing in the north, I can hardly believe they are the same ones that I have in my intense light garden. The color differences can be quite amazing.

And, finally, there could be a slight variation within one seed strain that might account for the difference in color from one generation to another (especially if it got cross-pollinated with another strain growing somewhere nearby, and that's a real possibility considering how prolific Morning Glories are.)

Agreed completely with donnabaskets. Here is an interesting link to follow.

Also, they could have got into the wrong packet at the packing plant! There are Heavenly Blues, and also some deep purple ones called Grandpa Otts and even one named after Mt Fuji.

Here is a link that might be useful: UVM on Color

Yes, I read somewhere that people should grow different varieties at least 1/4 mile apart. It could have happened there. I thought you meant a new packet sown turned out the wrong colour; sorry! :)

Thanks Hopflower. I'll mention that to her. I must have messed up her seed at some point :) I don't think that cross pollination occured to her.

A few years ago I had heavenly blue morning glorys turn from large blue flowers to small purple ones from the next generation and then again the following year. No other MG around to cross pollinate. This year I've planted a new pack of HB seeds. I can't wait to see if it happens again. I've just move to a new house even more isolated. Now there's even less chance crossing. We'll see its been interesting to