Here goes:
In almost every big flower shop in major cities they have some bonzai trees for sale. Bonzai trees, are those cute little japanese trees looking like big trees in a small scale. The structure and details is excactly as on big sized trees. Almost 100% of the customers forget that these little beauties needs everyday care and watering, so they drie up, and dies. That is where you enter the scene! Buy one 5-7 years old bonzai to your wife ($20-$25) She'll never going to make that tree survive, belive me! When its dead (2-3 weeks), you take over and use it for your diorama. The trees has the real look, because they are real trees! Do not buy those bent, curly ones that is expensive, buy those cheap young straight ones, and haggle! Offer the shop that you can buy dead bonzais, let your friends buy bonzais that you later gets for free! Just shake off the soil from the roots, and you have a tree with an excellent fundament for your diorama! I have now 3-4 trees (I love my wife) stacked away, waiting for their diorama to get ready!
Just wanted to tell you all my secret diorama tip, as a thank you to me, stay away from the bonzai shop in Bergen, Norway



Cheers,
Kurt Monsen