Do you mean which plants look good and flower at the same time - or 'companion' planting?

I don't know of any 'companion' plants, but suggestions for good combinations are Helenium, tall Asters, Verbena bonariensis and maybe Miscanthus (grass). Japanese Anemones also flower at the same time - I hesitate to suggest them though, as they can be thugs.

Νομίζω είναι θέμα γούστου. Τη τελευταία χρονιά εγώ τις είχα μαζί με κόσμος και ήταν καταπληκτικές. Χρειάζεται λίγη προσοχή όμως στους χρωματισμούς για να μη υπάρξει σύνκρουση χρωμάτων.

That's all Greek to me, Cos. :-(

Hi Spritzhenry,
Thats all Greek to you in real. Sorry we use our mother language. I think Ill use dahlias in front of my balcony.
Ill send u pics when in flower.

Please do! I've started my dahlias off in the greenhouse.
Don't worry about the language - it really wasn't a problem. :-)

Hi Bik...Just found your page...How are the Dahlias doing now we are into July...My favourites are Cactus Dahlias, with their spikey petals, but there are some beautiful Dahlias, some so big they need strong stakes...Another one I love too, is called 'Nippon'...I bought it in France, so don't know if it's available elsewhere, and has a petite flower, and grows to approx 1ft high....