Complete mystery…

Complete mystery…

Erm... I bought this plant, thought I knew the name, and it turns out I really don't. Now I don't have any idea how to care for this one. Can somebody name this plant?
Dahlia pics

Dahlia pics

the rest

the rest

Gardenia with everlasting buds.. :P

Gardenia with everlasting buds.. :P

Tomatoes

Tomatoes

Three unknown trees with berries

Three unknown trees with berries

Household tips

Household tips