Curio radicans (Blue Pickle)

A trailing succulent from southern Africa

Curio radicans, formerly known as Senecio radicans, is native to South Africa, Lesotho and Namibia. Its South African range includes the Cape Provinces, Free State, KwaZulu-Natal and Northern Provinces.

The species creeps or trails across dry open ground. The blue-green cultivated form develops curved fleshy leaves along slender stems and retains the low spreading structure of the species.

Curio radicans (Blue Pickle) plant care

Sunlight for blue-green trailing stems

Set Blue Pickle at a sunny south-, west- or bright east-facing window, introducing several hours of direct sun gradually. Move Blue Pickle into stronger sun in stages and watch the foliage nearest the glass. Adequate light keeps the curved blue-grey leaves firm and densely spaced along the stems, while weak daylight gives thin internodes and loose trailing growth. A sudden move from a shaded nursery to hot glass can bleach exposed leaves; insufficient light produces pale stretched growth with wider gaps between the blue-green leaves. Sun may alter the visible bloom or tint, but it does not remake the leaf.

A full soak for curved pickle leaves

Wait until most of the mix has dried before watering Blue Pickle. Soak the whole root ball and let it drain completely. Its curved succulent leaves tolerate the mix becoming almost fully dry, though persistent wrinkling signals that the root ball has remained dry too long. The stored water in the leaves supports a normal dry interval, not prolonged neglect; the roots also fail if the substrate stays wet and airless. Season, light, temperature, pot material and strand length all affect how quickly the pot dries again.

Shallow drainage along rooting stems

Fine shallow roots and rooting nodes spread most effectively through a broad container. Blue Pickle needs a shallow cactus mix loosened generously with pumice, lava, perlite or grit. A smaller amount of fine cactus substrate should hold brief moisture around the roots. Avoid dense soil and sealed cover pots, keep the stem bases exposed and rinse salt deposits from the mix occasionally.

Keeping glaucous trails dry in cool weather

Maintain Blue Pickle at about 16–27 °C, allowing a bright, relatively dry winter position around 10–16 °C. Keep the container above approximately 7–10 °C. Cold damp mix is far more dangerous than cool dry air, and a hot air stream can exhaust the tips while moisture still remains near the roots.

Blue Pickle needs no special humidity increase. Normal room air, combined with open placement, lets the stem bases and mineral surface dry as intended. Avoid crowding the hanging pot against a wall or other foliage. A misting routine adds surface moisture without replacing a complete watering.

Light feeding for firm blue-green trails

When Blue Pickle is producing stems, fertilise at about quarter strength. A further application is unnecessary for at least six to eight weeks. Feed lightly because fast, weak growth is more likely to snap and lose its blue bloom. Reduce or stop when cooler temperatures or weaker light slow the plant and the pot stays wet for longer. Continue modestly if it remains well lit and producing firm new growth. Avoid applying strong feed to dry roots, and rinse the pot occasionally.

Coiling Blue Pickle safely into fresh mix

Repot Blue Pickle when it has a dense root mat, unstable top growth, slow drainage or mix that repels water. Select a secure shallow pot only 2–4 cm wider. Keep the strands in loose coils during the move and disturb the roots as little as possible. If roots or stems are damaged, wait several days before watering thoroughly.

Pruning and rooting fast blue-green cascades

Let stems trail freely or pin selected lengths across the pot to build a fuller surface. Avoid a trellis, which rubs the waxy leaves, and trim long bare sections above a healthy node to stimulate side growth. Before moving Blue Pickle, coil the strands without tightening them and hold the crown so their wet weight cannot tear the roots. Tip pruning above nodes produces branching, and healthy cut lengths can be laid onto open substrate to thicken the top. Take out dead pieces at the base. Leaf-by-leaf wiping is too damaging for this growth habit.

Problems along the pickle-shaped leaves of Curio Blue Pickle

The curved blue pickles lose their plumpness

Firm wrinkles on a dry, well-rooted plant indicate that stored water is low. If the mix is wet or the vine base is brown, root failure is more likely. Inspect first, then water sound dry roots thoroughly or take healthy cuttings above a damaged base. Repeated small sips encourage a weak shallow crown.

New pickles are long, flat and far apart

Low light stretches both stems and leaves, weakening the compact blue chain. Move the plant gradually into stronger light and ensure it reaches both the pot surface and the hanging ends. New growth should become closer and fuller; old flattened leaves will not change shape.

Pale dry patches appear on the window-facing side

Blue succulent tissue can scorch after an abrupt exposure to intense sun. The patch is dry, fixed and usually confined to the exposed side. Acclimatise more slowly and retain any firm green-blue tissue. A wet-looking patch or a lesion advancing along the stem is not ordinary sunburn.

Pickles turn yellow and translucent near the pot

This combination points to excess moisture and early stem rot. Thirst produces dry, deflated tissue. Lift the vines, clear dead material and cut every affected strand back to a firm interior. Allow clean tips to callus before rerooting in a gritty mix. Do not wait until the hanging section collapses.

Pet access to Blue Pickle stems

How cats and dogs respond after eating Curio radicans is unknown. Keep the curved leaves, trailing stems and loose cuttings outside their reach. If any part is swallowed, contact a veterinarian and identify the plant as Curio radicans, sold as Blue Pickle.

Blue Pickle and the name Curio radicans

Blue Pickle is a selling name inspired by the curved blue-green leaves. The name ‘Glauca’ also occurs on this cultivated form, although the two labels are not consistently separated in horticulture.

The Latin radicans means taking root and refers to stems that form roots where their nodes touch suitable ground. Carl Linnaeus the Younger published the species as Cacalia radicans in 1782. After periods in Kleinia and Senecio, the name Curio radicans was published in 1999.