Plants and Flowers

The Dutch branch of the TNT post service has decided to make its contribution to planting of greenery and produced stamps with attached to them flower seeds.
As the advertising the post service has made a lovely advertising picture of a letter box with TNT logo with envelopes with bunches of flowers. However it is necessary to note, that seeds will not grow.
The plan of the campaign is that the addressee, having received the letter, can unstick a thin layer of plastic from a stamp and sow seeds in the ground, having created a small garden.
On such stamp bed should grow pansy, petunias, gillyflowers, lobelia and toadflax - seeds of all these flower make the mixture in under the stamps.
TNT states, these are first-ever produced stamps with seeds. The general edition of this non-standard post production makes 550 thousand copies.