With the year coming to a close, it seems appropriate to review the key points covered in the eighteen articles on orchid cultivation published in 2024 and 2025. The summary includes several links to help readers refresh their memories if needed.
If orchids are that attractive, it is to ensure their survival
Their pollinia are heavy and sticky, requiring a pollination vector, such as an insect or hummingbird, to reach the female stigma for fertilisation. Pollinators are attracted to certain floral attributes, such as the flower size, striking colors, captivating fragrance or nutritious nectar. Some orchids use mimicry, such as flowers that resemble female insects to attract male pollinators looking for a quick mating opportunity. To learn more about this fascinating subject, read The Elegance and Ingenuity of Orchid Flowers.
Botanical species
Botanical (i.e. non-hybridized) species are highly dependent on their natural habitat and pollinator. They therefore require specific growing conditions that closely resemble their original environment. The first challenge for the orchid enthusiast is to study and respect these conditions. To do so, it is advisable to consult reliable resources such as Understanding Orchids, by William Cullina, Houghton Mifflin Company edition
Fundamental horticultural needs
The four fundamental horticultural needs of orchids differ somewhat from those of other houseplants.
1) First, the light must be carefully calibrated according to the species being cultivated. As a general rule, we try to provide the maximum amount of light that the plant can tolerate in order to optimise its health and maximise the chances of it flowering. Unlike many traditional plants, orchids flower poorly in insufficient light.
2) Watering should be plentiful, but the substrate should be allowed to dry out between waterings to enable the gas exchange that is essential for root chemistry.
3) The ambient temperature should follow a daily cycle with a difference of 5–10 °C between day and night (9–18 °F), as observed in nature.
4) As epiphytes, meaning they grow suspended on tree branches, they have adapted to constant ventilation. Therefore, it is essential to ensure there is gentle air circulation in our growing space 24 hours a day, 365 days a year. This constant ventilation improves CO? capture and reduces the risk of fungal and bacterial diseases.
A more complete discussion is available at the following here.
Temperature, humidity and ventilation
The temperature, humidity and ventilation requirements for indoor cultivation are relatively easy to meet. However, achieving the necessary high light levels is more technically demanding, as our homes often lack light, especially in winter. Artificial lighting is often necessary. The only lights recommended are broad-spectrum LED lights (cool white, 6000K or 6500K). It is important to focus the light directly onto your plants to avoid wasting energy outside the growing area. You can find more details in the series of six articles on artificial lighting published on the LaidBack Gardener website.
Growth and flowering
When the conditions are right, botanical (i.e. non-hybrid) orchids grow vigorously, following a fairly strict growth cycle. This usually begins with the production of new roots in spring, followed by the growth of new foliage during the long, sunny days of summer. In autumn, the growth of many orchids slows down in order to accumulate carbohydrate reserves, which are essential for flowering in the spring. Click here for more details.
However, the flowering of hybrid orchids can be highly variable and sometimes occurs twice a year. Therefore, you should observe the cycle of your orchids using a simple monthly inspection protocol. This is easy to do and, with a little experience, very quick: simply pick up the plant and examine it from all angles to ensure its basic needs are met. You can also identify the plant’s progress in its annual growth cycle. This is also an opportunity to detect the need for any additional horticultural care, such as:
– repotting (only to be done when new roots appear),
– little fertilization (especially useful during periods of rapid growth),
– straightening and staking overly heavy flower heads,
– treatment for insect and bacterial or fungal disease control,
– as well as assessing the condition of the substrate and removing any unwanted debris. Ideally, these observations should be written down to better predict future growth cycles.
Personal note
The world of orchids is rich and captivating. I have been cultivating them for over 25 years and still find something interesting to do related to their cultivation every day. Some days I improve my growing setup. On other days, I assess the progress of my plants. I regularly meet other enthusiasts who enrich my life with their knowledge and friendship. I hope our posts have helped you to appreciate their beauty and refinement. Wishing you just as many botanical delights and wonders in 2026 !
Thank you so much for this very informative article Mr Charpentier. The growth cycle was an eye opener for me.
Your feedback is appreciated – Thanks !