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Guide to planting cannabis by the moon


Organic Fanatic
I found this very useful site that makes it easy to know when to sow etc


Information from the net about Lunar Calendar Gardening
In ancient times when man had not quite got round to inventing the wristwatch, the most reliable source of telling the time was the sun, moon, and stars. There seems to be several opinions of who came up with the moon planting calendar first. Was it the Egyptians or the Babylonians? It is more than likely that each and every farmer had a planting calendar based on the moon phases, and there would be different variations depending on the geographical location. As their calendars where passed on through the generations they evolved to cover the different crops they tried to grow, and the more productive farming techniques used.

It was noticed that different plants grow better when they are planted during different phases of the moon. Each of these phases imparts an influence on the way vegetation grows on the planet through the rising and falling of the moisture in the ground and in the plants.

To provide more accurate records it was noted that certain crops faired better when planted whilst the moon was in a specific constellation. As the moon can take only 2-3 days to pass through a constellation, the planting calendar was a 'cutting edge' technology.

Planting was not the most important time for the farmer, harvest time also had to be recorded. If you harvest at the correct time your crops will last much longer. It is down to how the plant stores the water in the fruit/crop at different times of the Luna cycle.

Moon planting rediscovered

We in our modern and advanced civilization are rediscovering the benefits of planting by the Luna cycle and various sources are being used to generate Moon Planting systems for us to use. Some of these systems would appear to contradict each other in places, but it is important to remember they are guides for you to use and modify, they are not an exact science.

Three Moon planting methods

There are three methods for planting by the moon. The Synodic, or waxing and waning cycle, the Sidereal, and the Biodynamic cycle.

Synodic (waxing and waning) cycle

This is a simple form of Moon planting which divides the Luna cycle into four phases or quarters. This cycle takes 29.6 days to complete. It then groups plants into categories, Root Crops, Foliage, Crops with seeds on the outside, and crops with seeds on the inside. Then it assigns plants to the phases of the moon which best suits there growing characteristics.

Biodynamic cycle

Secondly, there is the more detailed method using the 12 Zodiac signs as a method of position the moon, for more accurate planting. This method was developed by Rudolf Steiner in 1924, and the Zodiac signs used where the actual positioning of the signs in the sky, when the moon passed through them. In addition to the position of the moon, Venus ans Saturn also played a large part in the Biodynamic farming calendar. Form more information see the Wikipedia Article on Biodynamics.

Sidereal cycle

Lastly the Sidereal cycle is very similar to the Biodynamic cycle except only the moons orbit around the earth is used to define the best times to sow and harvest. The orbit is divided up into 12 equal 30 degree sections to represent the position of the moon in the sky, but it may not be the same as the current moon position. The sidereal cycle takes 27.3 days to complete.

Which of the above methods is better is up to you to find out. I suggest starting with the Synodic as a general rule and whilst you record the results, read up on the other two.


Some more interesting information
In 2011 I conducted several trials with plants alongside each other, comparing growth and weighing harvests. To study any differences between waxing and waning, I sowed half the seeds two days before full moon (waxing) and the other half two days after full moon (waning).

Carrots sown either side of the full moon in mid-March showed stronger growth of the waxing carrots, and when pulled in June, those yielded 7.8kg of roots compared with 4.8kg from the waning carrots. This difference arose partly from greater slug damage to the waning-sown carrot seedlings – and was that because they were weaker, due to moon phase? However I then sowed two batches of turnip seed, waxing-waning in the same bed in July: they yielded 3.3kg and 3.5kg respectively by November, while potatoes in another bed also reflected that result with 4.3kg waxing and 4.7kg waning.

Then in 2012 I ran a similar experiment to the first one above, and in the same bed too! I had spread two inches of cow manure on it in November and there was a lovely soft surface by March. Carrots sown two days before full moon on 6th March yielded 9.9kg, while those sown three days after full moon on 11th March yielded 9.2kg, of similar excellent quality (despite the lack of rotation….), so less of a difference than in 2011 but still significant.

Such variable results can raise questions as much as give answers, and there are other factors to consider, besides total yield. For example, a comparison of french beans, in two large beds, gave 15.41kg from sowing two days before full moon, compared with 13.97kg from those sown two days after full moon. But the lower yield of waning-moon beans was offset by their greater longevity: although they produced less initially, when beans were prolific, they gave more in September when beans were scarcer.

Another aspect of moon sowing is by constellation, with the moon changing every two or three days compared to a month for the sun. For example, sowing with the moon in Pisces, a water sign, should emphasise leaf growth (good for lettuce, spinach) while sowing in Taurus, an earth sign should encourage root growth (good for carrots, beetroot) and sowing in Leo, a fruit sign, should result in proportionately more tomatoes and courgettes.

So we sowed half a bed of carrots with moon in a water sign and half a bed, one week later, when it was in a root sign. Both grew well, in fact the former looked stronger, but after weighing up the final harvest I found a 20% increase in total yield of carrots from the root day sowing. And two sowings of dwarf french beans, half on a leaf day followed by half on a fruit day, saw the latter yield 9% more.

Hope someone finds this useful/interesting!


Active Member
of course what was i thinking, i lived in Germany, gotta be similar right ?. im spending time today to get some pics up from my grow .. this summer and last