Q.planting canna seeds
Can I plant canna seeds at this time of year? I live in Southern Spain.

It all depends on what the avergage temperatures are in your area. Canna seeds are a bit picky about how they get started: They need to germinate in 21-24 C. (70-75 degrees F.).
If you have enough of a growing season left to allow them time to mature, then go ahead and plant them once they've germinated, otherwise saver them for next spring.
Here is some additional information on Canna germination and care:
https://www.gardeningknowhow.com/ornamental/bulbs/canna/planting-canna-lily-seeds.htm
https://www.gardeningknowhow.com/ornamental/bulbs/canna/canna-lily-care.htm