[mikeimp]

I am looking for a seedless thornless  Blackberry variety ,anyone know of one? If not what is a Loganberry like,are they seedless and thornless? or are they too much like a Raspberry.

Thanks
Michael

[sunshineband]

http://www.allotment-garden.org/grow-your-own/loganberries.php

Here is some info about loganberries from the link above (Grow Your Own) which will explain what the fruit is. They are more tart than a raspberry and need to be left until they are dark purple before harvesting to be at their best.... they make great jam or jelly 

I have never heard of a seedless blackberry though.

[mumofstig]

I have never heard of a seedless blackberry though

Me neither.
The berries only form to carry the seeds, so don't think you'll find one. 

Thornless is easy though; Oregon Thornless blackberry immediately springs to mind - but there are more.........................
Loch Ness, Merton, Black Satin etc

http://www.chrisbowers.co.uk/category/blackberries/

I always make seedless jams from my fruit though