Actual size and flowering may vary slightly based on season.
Fairy Castle Cactus
Fairy Castle Cactus is a small, slow cactus with many jade-green branches that point straight up, so a pot of it looks like a tiny castle with turrets. New branches keep forming from the base, and the clump gets fuller every year. It stays small for a long time, which makes it an easy patio pot or windowsill plant. It needs little water, with a good soak only after the soil dries out.
Best for: patio pots and small containers, a bright covered porch or windowsill, and dish gardens with other small cacti.
It stays small for years, so it fits a patio pot or a windowsill. Use a fast-draining cactus mix in a pot with drainage holes.
The upright green branches add height to a dish garden of small cacti. New branches keep forming from the base, so the clump fills in over time.
In a pot it can sit on a bright porch in the warm months and move under cover on frost nights. Give it at least four to six hours of sun a day.
It is frost tender, so bring it inside or under cover when nights drop near freezing. Wet soil in winter leads to rot, so keep it nearly dry then.
From spring through summer, water thoroughly and then wait until the mix dries out completely before watering again. Always use a pot with drainage holes.
In winter, water very little or not at all until spring. Cold, wet soil is the most common way to lose a cactus.
Give it at least four to six hours of sun a day. Move a new plant into stronger sun slowly so it does not scorch.
It is frost tender and is damaged near 30°F. Move pots inside or under a covered patio when nights drop near freezing, and bring them back out once frost danger passes.
Drainage test first. Dig the hole and fill it with water. If water is still sitting in the hole a day later, you likely hit caliche, clay or hard soil, so fix the drainage before planting. If it drains very fast, the soil is sandy. Standing water around roots is a common reason new plants fail.
Weed cloth. Cut it away from the planting hole and where the roots will spread. Remove any plastic sheeting completely, since it keeps water and air out of the soil.
Rock or decomposed granite with no soil underneath. Bring in soil close in texture to your native soil, mix it with the soil below, and build up enough depth for roots before planting.
If you can break through. Use a breaker bar, pick, or jackhammer. Dig through the caliche and break out the solid chunks. Backfill with the soil you dug out, with no compost or manure in the hole. Confirm drainage before planting.
If you cannot break through. Dig narrow holes through the hard layer beside the root ball, not under it, and refill them with the same soil, not gravel. If it still will not drain, plant on a low mound of the same soil.
Root ball. Check the outside edges for any roots circling around. Loosen or cut those so they grow outward. Do not break up the center of the root ball.
Depth. The top of the root ball should sit at or just slightly above the surrounding soil level. Planting too deep can lead to rot and kill the plant.
Drip emitters. At planting, put the emitters on the root ball, on different sides of the plant. After about 2 months, move them to the outer edge of the root ball. Over the first year, add emitters farther out toward the edge of the branches as roots grow. Once a plant is rooted, never water only at the trunk.
Why is it called Fairy Castle?
Its many upright branches look like the towers and turrets of a tiny castle. The more branches it forms, the more castle-like it looks.
How big does Fairy Castle Cactus get?
It grows very slowly, often only an inch or two a year, so most plants stay about a foot tall for years. Given many years, it can reach several feet in a large pot.
Does Fairy Castle Cactus bloom?
Flowers are rare and usually only come on older plants after many years. Grow it for the castle shape, and treat any flower as a bonus.
How much sun does it need?
Give it at least four to six hours of sun a day. Ease a new plant into stronger sun slowly so it does not scorch.
How often should I water it?
Soak it in summer only after the mix dries out completely. In winter, water very little or keep it dry until spring.
How cold can it take?
It is frost tender and is damaged near 30°F. Bring pots inside or under cover when nights drop near freezing.
Can I plant it in the ground?
It is mostly grown in pots because it is frost tender. A pot lets you move it under cover in winter, so keep it in a container in the Valley.
How do I start new plants?
It roots from stem cuttings. Let the cut end dry for a few days, then plant it in dry cactus mix.
Fairy Castle Cactus for sale in Arizona, delivered to you
Fairy Castle Cactus (Acanthocereus tetragonus 'Fairy Castle') is a slow, many-branched cactus that looks like a miniature castle. It is mostly grown in pots in the Valley. Below is what to expect, from size and sun to water, frost care and the rare flowers.
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Fairy Castle Cactus in Arizona
Fairy Castle Cactus is a slow, many-branched cactus that looks like a tiny castle. In the Valley it is mostly grown in pots so it can be moved under cover on frost nights.
How big Fairy Castle Cactus gets
It grows very slowly, often an inch or two a year, so most plants stay about a foot tall for years. With many years it can reach several feet.
Sun for Fairy Castle Cactus
Give it at least four to six hours of sun a day. Move a new plant into stronger sun slowly so it does not scorch.
Watering Fairy Castle Cactus
Soak it in summer only after the mix dries out. In winter, water very little or keep it dry until spring.
Frost care for Fairy Castle Cactus
It is frost tender and is damaged near 30°F. Bring pots inside or under a covered patio on frost nights.
Does Fairy Castle Cactus flower?
Flowers are rare and come only on older plants after many years. Most people grow it for the upright, castle-like branches.
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