I've just moved and am going to try and make a cottage style border in my garden, but I'm unsure of the growing nature of the following - Iris', Papavers, Verbena Bonariensis, Gladioli and Alliums. Do these plants require their own designated growing space, or will they compete and climb up through other plants? I really want to fill my borders up and would love to have these plants, but just don't know the habit of their growth.
Also, geraniums, do they only have a small crown? I thought they were more of a scrambler and didn't have much of a base, so wondered, when it says spread 45cm - 60cm, does this mean I shouldn't fill in the ground in between, or can I plant up against them and they'll grow over over plants?