Site and growth rhythm

Conditions are easiest to control in a bright site sheltered from prolonged rain, with good airflow. Increase sunlight gradually after winter and after buying plants. Under glass or on a sheltered balcony, body and substrate temperature may differ greatly from ambient temperature. Assess the site through plant behaviour, growth and pot drying rate. [Szychowski b.d.c]

In my earlier experience, keeping plants on a rain-sheltered terrace in summer gave good results and favoured flowering. I treat this observation as a description of my collection's conditions. A similar arrangement requires adjusting shelter, light and watering to the particular site. [Szychowski b.d.c]

Spring and early autumn can be periods of pronounced growth. Some plants slow during intense summer heat. If summer is mild and a plant makes new growth and uses water effectively, the calendar alone does not justify stopping watering. Low winter light usually favours reduced growth in mature plants. [Szychowski b.d.c]

Substrate, pot and pH

A lasting mixture structure and root access to air matter most. Mineral components of different particle sizes allow regulation of water retention. Large quantities of dust can fill pores. “Mineral” alone does not say how long a particular pot will remain moist. Mixture choice requires consideration of container size, temperature and watering method. [Szychowski b.d.c]

In an older text, I described good results from a finer mixture layer below and gravel around the root collar. This is the author's experience, rather than proof that gravel solves every drainage problem. The pot needs clear drainage holes, and the whole root ball should dry in a suitable time. [Szychowski b.d.c]

The archived recommendation of pH 6.5–7 and addition of calcium-containing components requires consideration of the water and substrate used. Limestone in the habitat does not automatically set every potting mixture's pH. Liming and acidification require assessment of pH and water and substrate properties. Recipes remain accounts of particular authors' experiences. [Szychowski b.d.c]

Water and fertilisation

Watering should match plant and root activity. Excess water should drain after watering. The next watering depends on substrate drying, weather, pot size and plant condition. A fixed interval, such as weekly, gives less information than observing these conditions. Persistent moisture combined with cold and weak light increases the risk of root problems. [Szychowski b.d.c] [13-WWW]

During growth, cactus fertiliser can be used at a dose suited to the product and watering frequency. Older material recommends limited nitrogen. It provides no comparative data defining one dose, EC or concentration for six species. Dosage depends on the fertiliser and collection management. [Szychowski b.d.c]

Zimowanie

Mature plants on their own roots are usually overwintered dry in a bright or moderately bright, airy, above-freezing location. The archived account gives 6–10°C as experience for part of the genus. A. ornatum received the more cautious recommendation of above 10°C. Materials for A. caput-medusae provide no comparable, tested scheme. [Szychowski b.d.c] [Bartylak 2007] [11-WWW]

Seedlings, weakened plants, rooting specimens and grafted plants are separate groups. Rootstock needs may differ from the scion's. Warm overwintering with insufficient light risks unwanted growth, while dry overwintering can excessively dehydrate very small seedlings. Decisions should therefore account for development as well as the label name. [Szychowski b.d.c] [11-WWW] [11-WWW]

Repotting and problems

Repot plants when required by root or substrate condition or container size. Protect roots from tearing and breakage. If injured, allow wounds to heal before watering. The collected studies do not support fixed repotting intervals for all plants. [Szychowski b.d.c]

A softening base, decay smell, spreading spots or no response to water require checking roots and substrate. Sudden pale damage after changed exposure may reflect excessive light. Check for mealybugs and other pests too. Identify the problem before selecting a remedy. [Szychowski b.d.c] [13-WWW]

Sowing and grafting

Manage sowing as a documented batch. Record name, source, sowing date, seed number and germination progress. Young seedlings need more even water availability and gentler light than adults. Gradual ventilation and acclimation reduce abrupt environmental changes. [Szychowski b.d.a] [Szychowski b.d.c] [11-WWW]

Grafting maintains selected forms, accelerates development or rescues injured plants. Own roots often better preserve natural body proportions. Method selection follows the cultivation goal and plant condition. In the archived text, I described my preference for plants on their own roots alongside other growers' grafting experience. [Szychowski b.d.c]