Does anyone know how often I should use the Canna Vega in a weeks amount, also when should I move to the next Canna Flores & P-K13/14?
At the moment I haven't used anything other than water and there 2 weeks into it. I heard that it's best to start the feed around the 3rd week, is this about right?

It depends alot on your plants, indoor or outdoor?Hydro or Soil? If in soil generally you only want to feed 250ml per day if under HID lighting. You dont want to soak the soil because that restricts air to the roots. You want your soil to dry out then feed. This helps the roots get stronger by searching for food and stretching therefore making them stronger. If there young plants you may only need to feed once a week. If there taking up a ton of water you may need to feed everyday. Rule of thumb for me is 250ml of feed/water everyday if plants are healthy. It wont seem like alot, but trust me it works. Also dont start at full strength on the nutes. Work up to it.

And yes you can start the canna vega. Just start lightly. Dont use recommended dosages, ITS TOO MUCH. Build up to it. Youll want to start the P-K13/14 when you switch to flower. I havent used canna but once, but Im assuming P(phosphorous) and K(patassium) is what that stands for and there for is a bloom nute. Dont use this for veggin your plants. When you switch your lights to 12/12 thats when you use the P-K13/14

Thanks for the reply I appreciate it.

At the moment the plants are nearly 3 weeks old and are in a greenhouse. I have been watering them every 2-3 days recently.
They are in Canna Terra Soil as I decided to pay the money for the high quality products. Do you think it would be best to add the Canna Vega in about 1 week or next few days?
When you mention 250ML a day, do you mean the total water amount per plant?