Nasturtiums are easy to grow, very colourful and you can eat the leaves and the flowers. I'm trying them in one of my window boxes ,Princess of India which has deep red flowers with chocolate coloured leaves. I believe you can get mini ones too. My packet of seeds was under a £,an offer. Well we'll see how it goes.
Busy Lizzies are great, plant in tubs now and they go on well into the Autumn. Pelargoniums more expensive but last until the frosts arrive in late Autumn. Calibrachia are pretty and look well in smaller pots. Petunias of all colours, there’s a lovely new one called vanilla sky.
The primroses are spring flowers and perennial so don't forget rid of them.
Pelargoniuums and mine are flowering again having been left in and neglected all winter. They were in a sheltered spot out of the rain and fairly dry over winter.
Petunias, impatiens (busy lizzies), begonias are all colourful. I have agapanthus growing in pots, they do well in borders too and are perennials.
You really can't beat Pelargoniums for being neglected. The range of hybrids has increased. I get mine in the local market . If you are careful-you can winter them in your kitchen then as they will become leggy give them a cut and plant out after the frosts
Most other plants are too tender . I always put my cooled used tea bags on top of the soil to keep moisture in . I've got a huge variety of plants in my pots and all of them need watering almost daily .
I've had beautiful displays of iris germanica but you're left with just leaves for the rest of the year . I recommend the variegated one. Irises aren't thirsty plants . Lavender is easy .After a few years it tends to become woody and ugly. Rosemary is another idea .
Last year I had Tidal Wave Petunias, Osteospermum, Busy Lizzies and Fuschias in groups of pots. If you like profusion I would recommend them. They flowered right up to the first frosts.
I'm going for begonias for shady spots and geraniums (sented leaf ones) for sunny pots. I always pot up a few nice grasses to mingle with them. I find one variety of anything often (to me) looks more spectacular than a mix!
Can I have your suggestions please? I had primroses last year which were very colourful but didn't last long. The year before some colourful daisies, although these were a bit expensive they did last and were very pretty. Currently have heather and trailing ivy in one and several more troughs and pots to fill. Thanks for any ideas to bring some colour to my garden after such a dull winter!