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1. What is the best and easiest growing method for starters?

The easiest growing method for inexperienced growers is the CANNA TERRA line. Growing in potting mix (TERRA) is easier than growing in other substrates because you don't have to be very precise in order to get wonderful yield.

2. What is a substrate?

A substrate is a medium in which roots of plants can grow and which enables the plant to stand up.

3. Why do I have to use a different nutrient for both the growing period and for the flowering period?

a. The plant needs different proportions of nutrient elements in these different stages of development.

b. The plants acidifies the root environment when it starts to flower. This means the root environment needs different elements.

4. How do I know when to start giving my plant the flowering nutrient?

As soon as the first signs of flowers appear.

5. What does A & B mean?

A & B together are the nutrients a plant needs. They are separated into a bottle of A and one of B to make the solutions as concentrated as possible. Always use A and B in equal amounts.

6. Why are A & B not available in 1 bottle?

If A & B would be together in one bottle much more volume would be needed to dissolve the nutrients. Never mix concentrated A and B together since insoluble nutrients (gypsum) will be formed.

7. What is the biggest difference between chemical nutrients and biological ORGANIC nutrients?

The biggest difference is their origin, which is the reason why the organic nutrients can be used for organic growing.

  • Biological (organic) nutrients are released slowly.
  • Mineral fertilisers are available from the start.

8. What is the shelf life of CANNA products?

Most CANNA products have a shelf life of two years, but there are some exceptions. Below you can find a list with the shelf life of all the different products.

ProductShelf life in yearsProductShelf life in years
CANNA Aqua Flores A 3 CANNA Nitrogen 2
CANNA Aqua Flores B 3 CANNA Phosphorus 2
CANNA Aqua Vega A 3 CANNA Potassium 2
CANNA Aqua Vega B 3 pH- GROW 5
pH- BLOOM 5 pH Plus Pro 5
Organic Acid 2 CANNA PK 13/14 5
CANNA Start 3 CANNA Tracemix 2
CANNACURE 1 CANNA Hydro Flores A hard water 3
CANNAZYM 2 CANNA Hydro Flores A soft water 3
CANNA Coco A 3 CANNA Hydro Flores B hard water 3
CANNA Coco B 3 CANNA Hydro Flores B soft water 3
CANNA COGr Buffer Agent 3 CANNA Hydro Vega A hard water 3
CANNA COGr Flores A 3 CANNA Hydro Vega A soft water 3
CANNA COGr Flores B 3 CANNA Hydro Vega B hard water 3
CANNA COGr Vega A 3 CANNA Hydro Vega B soft water 3
CANNA COGr Vega B 3 CANNA Terra Flores 3
CANNA Calcium 2 CANNA Terra Vega 3
CANNA Iron 2    

9. I want to try CANNA products can you please send me some samples?

We do not have samples of our products. The smallest size of bottles we have is 0.25 litres. We don't deliver to private individuals. Please contact one of our retailers.

PH and EC

10. What is the importance of pH measuring?

pH has a great influence on the availability of the different nutrient elements. Therefore be sure the pH is always in the right range. The best availability range in the substrate is from 5.2- up to 6.2.

But CANNA recommends a different range for each type of substrate:

TERRA 5.8 – 6.2
COCO 5.5 – 6.2
Others 5.2 – 6.2

11. What is EC?

EC means electrical conductivity. EC is a number presenting the total of dissolved salts in the water. They include salts originating from the water and salts that the nutrients added.


12. On your website/label you advice to use PK 13/14 one week while a shop recommended me to use it more weeks?

We recommend to use PK 13/14 always for one week! CANNA feeding already contains a certain amount of P and K. When the plant is in a certain stage of the flowering stage we can't increase the feed for the plant any more, so we change the PK-ratio by adding PK 13/14 for one week.

13. Which bacteria will Trichoderma kill?

Trichoderma (a fungus family) do not kill bacteria. Most Trichoderma protect the plant against harmful fungi. This is because they eat other fungi. They stimulates the root environment so roots can develop better and with more root hairs. As a result the plant gains more vitality.


14. What different kind of substrates are there to use for growing?

There are many different substrates and growing methods, which roughly can be classified into 4 groups. CANNA sells different nutrients specifically developed for these different substrates or methods. The four groups are CANNA TERRA (peat based mixtures), CANNA COCO (coco substrates) and for inert substrates CANNA HYDRO (run-to-waste) and CANNA AQUA (for recirculating systems).

15. What is the difference between CANNA Terra Professional and CANNA Terra Professional Plus?

CANNA Terra Professional contains perlite and black peat.
CANNA Terra Professional Plus contains tree bark and white peat. For that it is a higher quality product.


16. I'm using a re-circulating system. Should I use HYDRO or AQUA?

CANNA specially developed CANNA AQUA for recirculating systems. CANNA HYDRO should be used when using a run-to-waste system. Please do not mix those two up!


17. I'm part of the CANNA family but I don't want to receive the C-letter anymore. Can I unsubscribe myself for this?

Yes, you can always unsubscribe yourself from the C-letter! At the bottom of every C-letter (newsletter) there is a link where you can unsubscribe yourself from the C-letter. Or edit your profile, go to Newsletters and untick the selected newsletter(s).


18. I'm a retailer and want to stock your products. What to do?

In the UK we work with 2 wholesalers. If you want to stock CANNA products please contact one of our wholesalers in the UK. Their contact details are as follows:

Highlight Horticulture 01949 839727
Hydrogarden 0247-6651500

Once you have ordered CANNA products please register as an authorized retailer.

19. I'm a retailer and registered myself as a retailer but am still not authorised as a retailer. What should I do?

CANNA always checks with the wholesalers if your shop ordered products with one of them. That is why it can take a while before we authorise you as a retailer.

20. What are the advantages of being an authorised retailer?

Customers are able to find your shop in the shop localizer, you can download leaflets, grow guides and even product pictures. Of course you will stay up to date from all the developments regarding CANNA.