The botanical name of annual vinca plant
is Catharanthus roseus and the plant is also known as rose periwinkle or
Madagascar periwinkle. Actually the annual vinca plant is a versatile little
stunner with shiny green foliage and blooms of white, pink, rose, red, salmon,
or purple. The annual vinca plant isn’t frost-hardy, you can easily grow the
plant as a perennial if you live in USDA plant hardiness zones nine and above. How
do you start annual vinca from seed? Collecting the annual vinca seeds from
mature plants isn’t difficult but growing them from seed is a little trickier. Continue
reading to learn how to grow annual vinca from seed.
How to Get Vinca Seeds from the Plant
If you are collecting vinca seeds
make sure you look for long, narrow, green seedpods hidden on the stems beneath
blooming flowers. Just snip or pinch the pods when the petals drop from the
blooms and the pods are turning from yellow to brown. Make sure you watch the
plant carefully. If you actually wait too long the pods will split, and then
you will lose the seeds. Drop the pods into a paper sack and then place them in
a warm, dry spot. Shake the bag every day or two until the pods are completely
dry. You can also drop the pods into a shallow pan and put the pan in a sunny
(non-windy) location until the pods are completely dry. Once the pods are
completely dry you can open them carefully and then remove the tiny black
seeds. Place the vinca seeds in a paper envelope and then store them in a cool,
dry, well-ventilated location until planting time. The freshly harvested vinca
seeds usually don’t do well because germinating the seeds require a period of
dormancy.
How Do You Grow Annual Vinca?
You can easily plant the vinca seeds
indoors 3 to 4 months before the last frost of the season. Does vinca need
darkness to germinate? Cover the annual vinca seeds lightly with soil, and then
lay a damp newspaper over the tray because germinating the seeds of vinca requires
total darkness. Place the vinca seeds where temperatures are around eighty
degrees Fahrenheit. Make sure you check the tray daily and then remove the
newspaper as soon as the seedlings emerge – generally 2 to 9 days. At this
point, move the vinca seedlings into bright sunlight and the room temperature should
be at least seventy-five degrees Fahrenheit.
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