I used to have a nice chimney pot that I used as a planter. I found a few plastic pots that fit snugly in the top and swapped them around depending on what was looking good at the time. I had some nice spring bulbs like drawf iris in one pot, some spring flowers in another, lobelia for summer colour and I had one with a few sedums that filled in the gaps in between. Then one day my dad took a shine to it and now it's cemented to his roof filling it's original purpose.
If you can keep your head, while those around you are losing theirs, you may not have grasped the seriousness of the situation.
Or trailing lobelia - not remotely any of the things you asked for, but it can be blue / white and looks a picture when mixed trailing down a chimney pot. Easy to buy bedding from a GC or online.
Btw, are your current plants in a pot or have you filled the whole thing with soil?
It looks good if you have a well-shaped terracotta pot that rests on the top of the chimney. I also have a couple of chimneys with a marble slab on top. I use this to put my potted on stuff in the spring and as a table in the summer
In mine I alternate two insert plastic pots, the deep ones principally designed for roses. In late winter and early spring I have hellebores and, when they’re finished that pot is put behind the summerhouse and replaced with geranium Azure Rush. That one is a sport of Rozanne but tidier in habit. This combination gives visual interest for about 9 months in the year.
I have an urn that I grow a clematis in, not evergreen though.
Honestly, there is an urn behind all those flowers. Its about 3ft tall. The clematis has been in their for 3 years now and always does well. I just add a bit of fresh compost and a scoop of farmyard manure each year. The clematis is called Parisienne.
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I also have a couple of chimneys with a marble slab on top.
I use this to put my potted on stuff in the spring and as a table in the summer
B3 - are you thinking of calibrachoa?