Skip to content

How to grow cannabis on terraces – Alchimia Grow Shop

Plant transplanted into its first pot

How to grow cannabis on terraces – Alchimia Grow Shop

The cultivation of cannabis outdoors and concretely on terraces and balconies is one of the most widespread cultivation methods because we need less material and attention than for indoor cultivation. In addition, we can achieve very good results with a relatively economical basic investment.
The most important thing to achieve this culture correctly is tohave a terrace or balcony well exposed to the sun and to have at least 6 hours of direct sunlight.

If you have this, we will explain below the necessary equipment and the steps to follow:

  • Preferably quality seeds indicas Where indica/sativa because they are generally more compact, more branched and do not grow too high. This choice is above all based on a criterion of discretion. If height is not an issue then you can grow sativas. The fact of using feminized cannabis seeds or starting from selected cuttings will be of great help to take advantage of the available space to the maximum. It would be a shame to have to remove a male after all the efforts of transplants, watering? not to mention the empty space and the earth and the products used for nothing.
  • 0.25 liter, 11 liter, 25 liter or 45 liter pots (the latter size of pots will be for growers with a large terrace, otherwise best to use only the first three pot sizes listed).
  • Good quality soil that contains humus, pearlite and peat or coconut fiber such as the Light Mix of Biobizz or Bioaigua Soft Mix.
  • vermicompost
  • Guano powdered bats and bat guano liquid
  • Nutrihemp (ash of seaweed)
  • neem oilpyrethrum or other insecticide of biological origin
  • Propolis (fungicide and stimulator of the plant’s natural defences)
  • Bacillus Turingiensis
  • Cannabis fertilizer growth and flowering (preferably organic)
  • A small sprayer of 2 liters capacity
  • A pH meter and ph down (Acid)

Culture step by step

Once we have all the material, we will prepare to start the culture:

The best time to start terrace cultivation is between April and May. We prefer to do it during the first waning moon of May because if we do it before, we could end up with plants that grow too much and exceed our predictions in terms of height.

We will therefore put the seeds to germinate and when we see the first root appear, we will put them in the 0.25 l pots and we will water them immediately.

The following days, we will water when we see that the soil is drying on the surface (with water at PH adjusted to 6 without fertilizer). We will place the pots in full sun and wait for the small seedlings to appear, which can take between 5 and 10 days. During this period, we will expose the plants to full sun because otherwise the seedlings will sprout (the plant seeks light and the stem stretches) and will be stunted.


After more or less three weeks, the plants should be around 20 cm in height and reach the three tiers of actual leaves. It is at this time that we will meticulously remove the pot (better to do it when the substrate is dry) to check that the root structure is correct. If so, it will be time to transplant them into the next pot of more or less 11 liters in capacity.

For this transplant, we will prepare a substrate composed of 80% potting soil recommended for cannabis, 20% earthworm humus, ½ kg of powdered bat guano and 250 grams of Nutrihemp for 100 liters of final substrate. We will mix everything well so that the mix is ​​homogeneous before transplanting.

During the first two weeks after transplanting, we will water each time the soil dries on the surface and, as before, we will only use water with a PH adjusted to 6.

It is after the third week of transplanting that we will start adding oil.growth fertilizer mixed with water following the dosages recommended by the manufacturer.

More or less during the fourth week of transplanting (eighth from the start of cultivation, which is the beginning of June), we will start the apical pruning to favor the development of the plants in width and to prevent the plants from growing too high.

To get a nice bush, follow these tips:

At this time, the plant is more or less in its seventh or eighth stage of leaves and we will cut the apex (top of the plant) just above the fifth floor. This size will allowimprove the development of six to ten new main branches.



It is just after this pruning that we will carry out the definitive transplant in the 25 liter pot for those who have less space and in the 45 liter ones for those who have a larger terrace and want the plants to grow. more.

To perform this last transplant, we will prepare the substrate as follows: 80 liters of soil, 20% earthworm humus, 1 kg of powdered bat guano and 400 grams of Nutrihemp for 100 liters of final substrate.

Once the transplant is done, we will water with water only at PH adjusted to 6 for the first two weeks. From the third we will start adding growth fertilizer once a week until the first buds appear. What should normally happen in August when our plants are between 100 and 125 cm tall (not counting the pots).








From the moment the first flowers appear forming the buds, we will water with water mixed with salt.flowering fertilizer once a week (the other waterings are done only with clear water and adjusted pH) and it is once we see that the heads are really starting to form that we will add the nutrient solution based on guanokalong liquid. From then on, we will increase the frequency of watering with fertilizer to twice a week until we see the first signs of bud maturity (the pistils dry out and turn brown/red).

Once that moment arrives, we will proceed to a watering with clean water without fertilizer until harvest to help clean the plant and thus improve the taste and smell of the weed. During the process of cleaning the plant, it is quite possible that the color will become yellowish, so much the better. We want the plant to use all the nutrients it has in the leaves before cutting it. We call this process the senescence. Senescence provides a sweeter taste and less irritating to the throat.



When 80% of the pistils that form the buds are brown, the time of harvest will have arrived but to be 100% sure, it is better to get a microscope and rely on the color of the trichomes (resin glands) .

For more complete information on this subject, we recommend reading the following post: Harvesting Cannabis


Plants grown with this system in 25 liter pots will reach a height of 100 to 150 cm depending on the variety and will produce between 200 and 300 grams (dry) while plants grown in 45 liter pots can reach between 125 and 175 cm. in height and produce between 300 and 500 grams per plant depending on the variety.

Things to consider when growing cannabis on patios:

  • If the sun shines directly on the pots of our plants, the roots can reach 40ºC in temperature and it is strongly discouraged because they could cook and die. To avoid this, we can use white jars and protect them from the sun by caulking them or isolating them from the ground with a pallet or the like. The white pots have the particularity of reflecting the sun’s rays outwards.
  • It is recommended to have on our terrace other flowering or leafy plants that help create an adequate microclimate and help to hide our beloved plant.
  • If our terrace is very sunny and the heat wave is very present during the day, it is advisable to wet the ground and the walls well in the morning and in the evening to refresh the leaves. Attention, we will do this only in growth and until June/July (period of proliferation of the red spider). We’ll stop when the heads are formed.
  • If the terrace is exposed to the wind, we will provide ropes and stones to prevent the plants from falling.

Phytosanitary treatment:

When we grow outdoors, the plants are subject to many insect infestations. This is why we recommend carrying out biological preventive treatments that will later avoid the use of chemical insecticides that are much more toxic and harmful to our health, that of our family and our pets.

We will begin to carry out the preventive treatments from the transplant in the pot of approximately 11 liters and we will use the insecticide based on neem or pyrethrum mixed with propolis to avoid the appearance of spiderswhitefly or aphids just like the different types of fungi that affect cannabis.

This treatment will be carried out every 15 days and we will continue the application by alternating one spray per week with Bacilus Turingensis to avoid the appearance of dangerous caterpillars with a propolis-based spray to avoid the appearance of the propolis.powdery mildew. We will continue these sprays until two weeks are missing to harvest.

It is important to carry out all treatments, watering and transplanting at the beginning or end of the day when the sun is low.

The Alchimia team wishes you a good crop for this new season!

The reading of articles published by Alchimiaweb, SL is reserved for adult clients. We remind our customers that cannabis seeds are not listed in the catalog of the European Community. These are products intended for genetic conservation and collection, but not for cultivation. It is strictly forbidden to germinate them in certain countries, except those authorized by the European Union. We advise our customers not to violate the law in any way and we are not responsible for their use.

Leave a Reply

Your email address will not be published.