Probably not warm enough, specially where you are - they need a good hot summer to flower properly. I'm surprised they've survived if they're outside, they're not fully hardy.

Hi Bamboo,

Thank you for your quick response to my question.

As I cannot keep them inside what should I do with them now? I bought them from Ideal World, the shopping channel, as outdoor suitable.

Ah, yes, well, probably not the best place to practice anything other than 'buyer beware'. I don't know what to tell you - if they're not already in the warmest, sunniest, most sheltered spot you can manage, then move them to that?

I think we've been here before, Bamboo :-)))
I reported a few months ago that we had lost nearly all our oleanders in that fierce winter we've just had, when temperatures got down to -22°c, but I'm ever so happy to tell you that I was wrong, and although a bit shocked by the bad weather, every single one has kept going, and after a cutting back of affected parts, all are looking healthy and are sprouting merrily. Perhaps they are hardier than we give them credit for!
Bamboo is absolutely right, Mbmbmb, you need heat and sunshine in large doses to get flowers. Well, your oleanders do, anyway!

Hello again Bamboo and Gattina.

I keep the Oleanders in the hottest spot I can in my south facing garden. I also put them in the garage during winter. They get fed regularly and look healthy enough but they just do not flower. Six is a lot to give up on but I do not know what else to do. Do you think planting them in the ground instead of pots might help?

Thanks for your comments.

Have you tried giving them a high potash feed - if not, give them half strength tomato food weekly.

I had four but poor plants did not survive.I think they are for hot countries.I have seen in hot countries,thriving beautifully:)

As to whether pots or ground - we have all of ours in the ground, where roots are less likely to get frozen in winter, but most people round here grow them in enormous pots, and they thrive, but it does mean that come the frosts, they need to be moved indoors.

Thanks everyone I will try your suggestions.

I hope you are enjoying GoY ....
...... Mbmbmb .......

Hi Terratoonie,

So far, so good. Thank you.