Potting on and supporting grafted plants

Thankthecat

I've just bought grafted chilli and melon plants for the first time, both in pots about 5" diameter. The label says to pot them on into deep pots around 12" diameter, but should I really do this all in one step? It says nothing about increasing pot sizes... Any advice regarding suitable support for the melons would be gratefully received. I have some triangular wooden trellis, about 2' high and a foot across at the top - would that be suitable?

hogweed

Yes, just pot them straight on to the bigger pots - no need to step up using inbetween sizes. 
Can't help with the melon - I suppose it will depend on what type of melon you have - size?

Thankthecat

Thanks Hogweed - the melon is 'Alvaro'. Strangely, the info tag with the plant gave no indication of how big it would get and I've found nothing on Google. Of course, it's not on its own root so who knows?! From memory, info says to pinch out growing tip when it has 7 true leaves and not to allow more than 5 fruit to mature on the plant. I've got some old pairs of tights in case the fruit needs supporting, but I'm more worried about how much space the plant will need to spread out in.