Hello from California.

I understand the attraction of the lovely roses you ordered. There are some possible explanations for their failure to flower, but it is probably simply too soon. Next spring they will probably bloom. Pierre de Ronsard and Collette are both climbers. That means that the canes must be allowed to grow long, often for several seasons, before the plant will produce a beautiful flush of blooms. The same could be true of your other plants. They could very confused by the climate change between northern Europe and Thailand.

Have you considered roses with Asian species in their breeding? The evergreen nature of Teas, Chinas and Noisettes makes them ideally suited for tropical climates. They tolerate heat and humidity, and they bloom continuously, requiring no chill to perform at their best. Australia and New Zealand has outstanding suppliers of Teas, Chinas and Noisettes, as they grow well there.

In India, hybridizer Viru Viraraghavan is working with Asian species to create roses suitable for tropical climates. If you click on the Ezine link, search for Viru. You will find three articles about breeders trying to produce roses for hot climates. Using rose genetics to your advantage and matching roses to your climate will probably help you grow the best roses. Even my part of Northern California is far south of Britain, being comparable to the boot of Italy in latitude. Teas, Chinas and Noisettes excel here and are grown easily, naturally and with minimum fuss.

This is just food for thought. We all love the challenge of the exotic. These wonderful older roses are under-appreciated and exotic in their own right. I commend to you, for example, Archduke Joseph and Monsieur Tillier.

Good luck with your new roses. Next spring I'm sure you will see plenty of bloom.