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Walker's Cryptocoryne

Cryptocoryne walkeri

Araceae

PlantsDifficulty: ●●●○○Data: verified
Walker's Cryptocoryne — Cryptocoryne walkeri
📷 Hanno Böck · CC0 1.0 (Public Domain Dedication) · resized · Wikimedia Commons

About

Cryptocoryne walkeri is a rosette crypt from the river banks of Sri Lanka that shops sell under three different names - walkeri, lutea and legroi. They are one species, so a shelf holding 'Cryptocoryne lutea' beside 'Cryptocoryne walkeri' is holding the same plant twice, and some nurseries ship it mislabelled as Cryptocoryne wendtii 'Red'. Standing in front of the tank, separate it from its Sri Lankan relatives by posture and leaf edge rather than colour: walkeri carries stiff, firm leaves noticeably upright, while wendtii, beckettii and undulata sprawl into looser, lower, wider bushes, and its 8-12 cm blade is finely undulate only in the lower half where undulata waves along its whole length. If a plant is in flower the throat settles it - yellow to greenish yellow is walkeri, dark brown is beckettii or wendtii. How much light it wants is genuinely contested: the shop tables that file it as a low-light plant are contradicted by their own prose and by Dennerle, Wikipedia and Florida Aquatic, which all place it at medium, so treat medium as the requirement because that is what the catalogue photo costs. The dark bronze-green top and purple-red underside only develop under decent light over months; in a dim tank the plant reverts toward plain green, stretches longer leaf stalks and grows taller and looser - roughly 10-15 cm in bright light against 25-30 cm in shade, which is a leggier plant, not a bigger one. CO2 is not required but it is not decoration either: at 5-40 mg/l it is the difference between a clump that survives and one that fills in, and without it expect the gap to close over a season rather than a month. Expect it to melt after planting: leaves yellow, go translucent and dissolve within days. That is adaptation, not death. Trim the mush at the base, do not lift or move it, hold the parameters steady, and tank-grown leaves return in three to four weeks. It will melt again if you swing the water, so change no more than a third at a time and change it gradually. In bare inert gravel it does not melt, it simply stalls: small pale leaves, no colour and no runners. Runners with daughter plants take about six months.

Care

Bury the rhizome in a nutrient substrate with a root tab and then leave it alone. It survives low light, but it only colours up and stays compact under medium light, and CO2 is optional rather than pointless - without either it stays green, leggy and slow. Change water gradually and never more than a third at once; sudden swings trigger the melt, which it recovers from in 3-4 weeks if you do not disturb it.

Diet

A root feeder that lives off the substrate: a root tab or nutritive base at the rhizome does more than any bottle. Dose the water column lightly but regularly rather than heavily and rarely - in bare inert gravel it stunts into small pale leaves, loses the bronze and purple altogether and stops sending runners.

Frequently asked questions

What water parameters does a Walker's Cryptocoryne need?
Walker's Cryptocoryne does best at 20–29 °C (68–84.2 °F), pH 5–8 and a general hardness of 2–30 °dGH.
Where should Walker's Cryptocoryne be placed in the aquarium?
Walker's Cryptocoryne works best in the midground and reaches around 30 cm.
Is the Walker's Cryptocoryne suitable for beginners?
Walker's Cryptocoryne sits in the middle of the difficulty scale — manageable for a careful beginner who has done the reading, but it has specific needs worth researching first.

Sources

Water & tank

Temperature20–29°C
Optimal temp.22–26°C
pH5–8
Hardness (GH)2–30°d
Carbonate (KH)1–18°d
Water typeFreshwater
FlowLow
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