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Gymnocalycium mihanovichii
- Common name
- Moon cactus
Moon cactus
Waterlow
Lightbright indirectHumiditylowgeneral genus data
Min. temperature8 °CJanuary
Don’t water – dry winter rest. Slight shrivelling is normal.
No feeding now.
Cool and bright, 8–15 °C: unheated room, stairwell, cold windowsill or frost-free greenhouse.
February
Don’t water – dry winter rest. Slight shrivelling is normal.
No feeding now.
Cool and bright, 8–15 °C: unheated room, stairwell, cold windowsill or frost-free greenhouse.
March
Gentle start: the first small drink once you see buds or new growth and it warms up.
First weak dose at the end of the month if it is actively growing.
Bright spot, east or west window.
Move it somewhere brighter and warmer and end wintering. Get it used to strong sun gradually.
If roots fill the pot: fresh soil, a pot 1–2 cm larger. Water sparingly for a week afterwards.
April
Deeply, but only once the soil is completely dry.
Cactus fertiliser once a month at half strength.
Bright spot, east or west window.
If roots fill the pot: fresh soil, a pot 1–2 cm larger. Water sparingly for a week afterwards.
It flowers next month – once you see buds, don’t move it any more.
May
Deeply, but only once the soil is completely dry.
Cactus fertiliser once a month at half strength.
Semi-shaded balcony or east/west window – protect from harsh midday sun.
After mid-May (last frosts) it can go outside – keep it in partial shade for the first 1–2 weeks to avoid sunburn.
It usually flowers now – don’t turn or move it, and log the bloom in your diary!
June
Deeply, but only once the soil is completely dry – more often in heatwaves, preferably in the evening.
Cactus fertiliser once a month at half strength.
Semi-shaded balcony or east/west window – protect from harsh midday sun.
It usually flowers now – don’t turn or move it, and log the bloom in your diary!
July
Deeply, but only once the soil is completely dry – more often in heatwaves, preferably in the evening.
Cactus fertiliser once a month at half strength.
Semi-shaded balcony or east/west window – protect from harsh midday sun.
It usually flowers now – don’t turn or move it, and log the bloom in your diary!
August
Deeply, but only once the soil is completely dry – more often in heatwaves, preferably in the evening.
Cactus fertiliser once a month at half strength.
Semi-shaded balcony or east/west window – protect from harsh midday sun.
It usually flowers now – don’t turn or move it, and log the bloom in your diary!
September
Deeply, but only once the soil is completely dry.
No feeding now.
Semi-shaded balcony or east/west window – protect from harsh midday sun.
Bring it in when nights drop below 13 °C. Check for pests first.
October
Taper off gradually: very little by the end of the month.
No feeding now.
Bright spot, east or west window.
Move it to its cool, bright winter spot and taper off watering. Log it with one click in the Care hub.
November · now
Don’t water – dry winter rest. Slight shrivelling is normal.
No feeding now.
Cool and bright, 8–15 °C: unheated room, stairwell, cold windowsill or frost-free greenhouse.
December
Don’t water – dry winter rest. Slight shrivelling is normal.
No feeding now.
Cool and bright, 8–15 °C: unheated room, stairwell, cold windowsill or frost-free greenhouse.
Gymnocalycium tip: Unlike most cacti it dislikes harsh midday sun – bright filtered light is ideal.
Growth photos
Virágzás 
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