77-84 Days to maturity. Matthiola incana. Harmony Mix Stock Seeds. Non-GMO, annual, open-pollinated, cold tolerant. Harmony Mix Stock seeds grow fantastically compact and exceptionally fragrant stock flowers that are sure to delight any garden or patio. The flowers come in a variety of vibrant colors and easily fill in the flower stem with their large blooms. This variety is even smaller than the famous Midget series and offers greater fragrance. You only need a few to liven up a dreary porch or entryway. Stock seeds are very small, measuring about 15,000 seeds/oz.