Yes, they will grow for many years. If they become sparse, cut them back.
One can pick periwinkle flowers anywhere they are grown and are allowed to pick them. Many gardeners grow periwinkle flowers and you can also find them in the wild.
Chamomile
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Yes, periwinkle (Vinca minor) is a flowering plant that produces small, blue or purple, five-petaled flowers. It blooms in spring and summer.
Periwinkle flowers are typically found in temperate regions across the globe, growing in gardens, woodlands, and on hillsides. They are known for their resilience and ability to thrive in a variety of conditions, making them a popular choice for landscaping.
Flowers can be either male, female or both. I'm not sure if the periwinkle is any specific 'gender'. I'd say the either or both applies for all flowers.
A wet nice area for them to maintain all there water
The periwinkle plant contains substances that are effective against leukemia. In fact, Vinblastine and vincristine are alkaloids found in perwinkle that are approved by the FDA and are used to make chemotherapy drugs. To read more about medical aspets of periwinkle plants, visit the Related Link.
Perrenial flowers such as dahliahs grow in the summer or late spring. And grow back every single year in the mid summer or mid spring.
A flowery one.
No, and yes Periwinkle (Cataranthus sp.) is a african/madagascarian genus and does not occur naturally in the Amazon. However, the commen Cataranthus roseus (highly toxic and highly medinal, check it out!) is a pan-tropic weed by now.