do i need to follow the advice about leaving 20cm between petunias to the letter?

[mamacoffee]

i planted out some yesterday then dh came home with some lovely geraniums that he bought! 20cm seems a big gap between the petunias can i fill it with some geraniums? dh reckons its fine and he does know more than me- but i told him i had to run it past the mumsnetters first

Are they in the ground or containers? I usually leave bout 2cm 4-5cm between my petunias in pots and they always thrive yes, they lays look lovely with geraniums.

They're in the ground. I did put the geraniums in in the end, glad to hear it should be ok!!