🌵 Cactus

Use a low-drainage, mineral-rich substrate (e.g. a cactus mix amended with coarse sand, pumice/perlite and fine gravel). Choose pots with drainage holes; avoid heavy peat-rich mixes that stay moist. Allow the root zone to dry out between irrigations to reduce the risk of rotting.

Sow in spring or early summer, when light levels and temperatures rise. Use a sterile cactus/succulent seed mix with very little drainage (fine mineral sand/stone with low organic matter content). Spread the seeds on the surface and compact them; do not bury them deeply (many cactus seeds require light or very superficial cover). Keep the soil evenly moist, but never soggy (misting or deep watering), at warm temperatures of around 20-30°C, with bright light/filtered sunlight. Ensure high humidity during germination (cover with a transparent lid/bag) and ventilate gradually after emergence to reduce seedling damping-off. Transplant seedlings once they are large enough to handle and have developed a small root system, spacing them out to prevent crowding; harden them off slowly in brighter light.

Feed only during the active growth period (generally spring-summer). Apply a low-nitrogen fertilizer at 1/4-1/2 of the label rate approximately once a month; stop feeding in autumn-winter. Avoid high-nitrogen products, which can cause sluggish, weak growth and increase susceptibility to rot.

Spread coarse gravel on the surface to keep the stem base dry, reduce algae and midges, and improve air circulation on the soil surface. Avoid organic mulches (bark/compost), which hold moisture against the crown.

Most cacti are self-supporting and do not require staking. Staking is only necessary for tall, etiolated (stretched) columnar cacti, or for top-heavy specimens that have just been potted; use a stake placed close to the stem and tie it loosely with a soft material to avoid scarring.

Some preparations use dried and cleaned nopal (Opuntia) pads, infused like a herbal tea. Use only food-grade material from which the thorns have been completely removed; the infusion can produce a mucilaginous (slippery) drink, so filter it if you wish. As with other fiber-rich cactus preparations, start with small quantities to assess gastrointestinal tolerance; if you are taking hypoglycemic medication, monitor your blood sugar levels and seek medical advice before making regular use.

Do not prune systematically. Remove dead, damaged or diseased tissue with a sterile blade; for propagation, take stem cuttings or cuttings, leave the cut surface to heal completely (a few days to a few weeks, depending on thickness), then root in a dry, granular mixture and water sparingly once the roots have formed.