Periwinkle offers a lovely little flower, but it is the leaves and the seeds that are used in folk medicine. The leaves and seeds are rich in the chemical vincamine, an alkaloid that has positive effects on memory and has long been used to combat the effects of aging.eriwinkle is used in folk medicine in the Philippines as a remedy for diabetes. Most of these practices are still followed. Rosy periwinkle grows up to two and a half feet tall. Leaves are oval and have a glossy surface.
C4 envelopes are 229 x 324 mm in size and a A4 card blank can fit inside or an A3 card blank folded in half. These C4 envelopes are ideal for sending A4 documents or certificates. C5 envelopes are 162 x 229 mm in size and fit an A5 card blank or A4 card blank folded in half.
Pick the standard size (or whatever size you want) and measure it. That way you know exactly which one you're designing for. I believe the standard ones are around 4in x 6in (one on side), which would make the full card around 8in x 6in. Thanks. I asked over here cuz well I was kind of lazy to go to the store to grab a card and measure it. I just use the double 5X7 post card size. It is 10X7 flat. You can get standard sized envelopes for these. Just do a Google search and you can find a manufactorer of these. For the printing of the cards, you can go to Post Card press and they will give you a quote for this.