Anyone grow Annual Vinca (Catharanthus roseus)from seed?

Sierra Foothills, CA(Zone 8a)

Hello. I am trying to grow some annuals to fill in before the perennials get large enough in my White Flower Border. I have a few established plants, and I had to remove some items that were overgrown, like lilac suckers and a ground cover that went amuck.

One thing that I have never grown from seed is vinca. I read that it is very difficult to grow from seed. It has to be kept warm, easy enough, but other factors may come into play since it is so tiny and slow-growing it is prone to a host of various fungal diseases. It must be completely covered from light until it germinates.

Does anyone grow this plant and have you had good success with it? (I do not have a greenhouse, but shelves and heat mats.)

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