Orchid care is easier than its reputation — if you understand the five basic principles: water, light, fertilizer, air, temperature. This page is the introductory guide. For each genus, there is also a separate detailed page with genus-specific characteristics — see the section "Care by Genus" below.
Written from over 25 years of experience in the Großräschen orchid business. Source status: current Kew World Checklist (as of 2025).
More orchids die from overwatering than from dryness. Rule of thumb: only water when the substrate is dry — usually every 5 to 10 days with pine bark, longer in winter, shorter in summer. The root color is the best indicator: green means wet, silvery means dry — silvery is watering time.
Ice cubes are not a good trick — even if some sales instructions suggest it. Tropical water does not come ice cold from above.
Orchids need a lot of light, but rarely direct sun. Rule of thumb: bright shade or partial shade.
Burn symptoms: yellow or brown spots on the leaves on the sun-facing side. Light deficiency symptoms: dark green foliage, long pauses without flowering.
Orchids need little fertilizer. Regular flower fertilizer works at half concentration, but special orchid fertilizers are better.
Signs of too much fertilizer: white crusts on the pot edge, brown root tips, yellow leaf edges.
Orchids like 50 to 70% humidity. Dry heating air in winter is the most challenging factor in German homes.
Temperature range for most indoor orchids: 18 to 25 °C during the day, 15 to 20 °C at night. A day/night difference of at least 5 °C triggers flowering induction in many genera — details in the genus-specific guides.
Orchids do not grow in regular potting soil. Most need airy material like pine bark, sphagnum moss, or semi-hydro granulate. Which substrate suits which genus: Substrate Guide.
Repot every 2 to 3 years, once the substrate has decomposed or roots are pushing out of the pot: Repotting Guide in 5 Steps.
Each genus has its own characteristics. Phalaenopsis tolerates almost everything, Vanda needs no substrate, Cattleya wants a cool rest period. Detailed per genus:
Only water when the substrate is dry — usually every 5 to 10 days with pine bark. The root color is more reliable than the calendar: silvery = water, green = not yet.
The three most common causes are lack of light, missing day/night temperature difference, and over-fertilization. Move to a brighter window, offer a week with cooler nights in autumn, check fertilizer dosage.
Phalaenopsis forgives most care mistakes and blooms reliably. Paphiopedilum-Maudiae hybrids are also robust. Vanda and Catasetum, on the other hand, are for professionals.
Special orchid fertilizer is optimal, regular flower fertilizer at half concentration also works. During the growth phase (spring to late summer) every 2 to 3 waterings, less often or not at all in winter.
Aerial roots are healthy roots that grow out of the pot — they absorb moisture from the air. Never cut them off as long as they are firm and green-silvery. Only remove dead (brown, hollow) roots.
No. Potting soil is too dense and retains too much water. Use special orchid substrate — pine bark, sphagnum moss, or semi-hydro granulate.
A yellow bottom leaf is usually normal (aging). Yellow spots on top indicate sunburn. Yellow soft leaves are often root rot — take the plant out of the pot, check roots, cut away rotten ones, repot in dry sphagnum moss.
Yes, many genera benefit from it — sheltered partial shade, protected from heavy rain. Cymbidium, Cattleya, and Oncidium respond particularly positively. Bring them back indoors in September before night temperatures drop below 12 °C.
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