Auto-flowering medical cannabis seeds are not like standard seeds. They will begin to bloom only after a certain period, without considering the number of hours of light to which they will be entitled.

“Auto” seeds are therefore ideal if you need a constant supply of marijuana. Cultivating this type of seed is not very different from normal Indica and Sativa cannabis varieties, but some differences need to be considered.

Lighting time

There is a difference of opinion among growers as to the number of hours of light needed each day. In general, this varies from 16 to 24 hours a day. The average of 18 hours a day has therefore slowly imposed itself as a standard. So, it’s 18/6 from the beginning to the end of the life cycle.


  • From the 1st to the 13th day, the plants should only be fed with water.
  • From the 14th day, you can give it a few growth nutrients.
  • Your plant will flower between the 14th and the 28th day.
  • From the 28th day, you can feed your plant with a little blooming nutrient for about four weeks.
  • Stop giving nutrients to plants about a week before harvest.

Some nutrient producers advise to put very high doses of products, but it is generally advisable to put in very reasonably. Never forget that an overdose could kill your plant!


The soil is one of the most important things to focus on regardless of the type of cannabis seed you use. Usually, “auto” marijuana seeds like aerated soils are relatively low in nutrients.

The classic potting soil is not recommended for growing cannabis. It is recommended to buy potting compost or California soil from a “grow-shop” (hydroponics).

Size of the pots

A majority of auto-flowering cannabis seeds do not grow very large plants. Thus, it is not recommended to use large pots. Choose pots with a capacity of fewer than 15 litres.

If you meet the above conditions, growing “auto-flowering” cannabis plants should be child’s play.

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