Clarke's early strain was the result of a Mr.Clarke noticing an early-blooming plant of Ipomoea tricolor (in the mid-1930s) and collecting and reproducing the seeds.

He kept some for himself (which he also marketed and sold in various ways) and he sold some seeds to several different larger marketing companies.

The color of the Early blooming Heavenly Blue was the same color as the later blooming Heavenly Blue of that same time period, which was a lighter color than the darker 'improved' version of Heavenly Blue which was pushed by the seed companies in approximately 1994.

There are at this point in time many different shades of color generally referred to as Heavenly Blue, as different strains from many different parts of the world have become more readily available and have additionally cross fertilized.

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