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Most hydroponic growers spend their time battling acidity, but alkaline conditions come with their own unique challenges. In this blog we break down the crops that naturally tolerate high-pH soils, and how this knowledge can help hydroponic growers dealing with alkaline water, calcareous inputs, or pH drift.
If your source water is alkaline, you’re exploring new crop options, or you simply want to understand how extreme pH affects plant physiology, this guide is for you.
In traditional agriculture, high-pH soils (typically 7.5–9.0) are common in arid regions, calcareous landscapes, and areas with sodium-rich subsoils. For hydroponics, alkaline conditions often arise due to:
Acid-loving plants suffer quickly — but alkaline-tolerant crops create new opportunities.
These species won’t thrive at extreme pH but can tolerate moderately alkaline environments better than most.
Barley is highly tolerant of alkaline soil, making it one of the most resilient cereals.
However, it often develops manganese deficiency at high pH; something hydroponic growers may need to supplement.
Sugar beet excels in alkaline and saline soils, a rare combination, making it useful in marginal agricultural land.
Cotton thrives in sodic, calcareous, high-pH soils such as those in Central Asia (the “Stans”).
While not suitable for hydroponics, it demonstrates extreme pH tolerance.
Fast-growing and drought-hardy, sorghum tolerates high pH far better than maize.
As a nitrogen-fixing legume, alfalfa performs surprisingly well in alkaline soils.
Many nitrogen-fixers share this trait.
Buffalo grass and Bermuda grass tolerate alkaline sports turf conditions.
While these crops aren’t typical hydroponic species, they demonstrate how plant families differ in pH tolerance.
Now we enter an extreme zone where very few food crops survive.
Most alkalinity-tolerant plants at this level are shrubs or trees:
These aren’t edible crops, but one edible plant does survive this harsh environment…
Atriplex, often called orache, garden orache, mountain spinach, or Atriplex hortensis, is the standout alkaline-tolerant edible crop.
Spinach is notorious for “self-destructing” in hydroponics:
This makes orache a legitimate commercial alternative.
Originally native to Europe and Asia, orache is now naturalized across:
Seeds are easy to find — or occasionally possible to forage.
Sometimes used as a spice (mesquite seasoning) but generally a shrub/tree unsuitable for hydroponics.
A famous desert shrub from Uzbekistan and the Aral Sea region.
Great name — but not edible and not useful to growers.
Mediterranean tree crops that tolerate mild alkalinity, but again not hydroponic staples.
Even if a plant is tolerant, that doesn’t mean it requires extreme pH.
Orache grows in gardens around the world. It doesn’t need high pH — it just tolerates it.
For hydroponics, the ideal pH range still sits around 6.0–7.0, even for alkaline-friendly crops.
This means:
Most growers using products like Liquid Gold can grow orache successfully without altering their system.
Growers struggling with:
…may find orache an incredible addition to their crop portfolio.
Alkaline-tolerant crops represent an overlooked area of hydroponic innovation. While most leafy greens struggle when pH drifts high, orache (Atriplex) stands out as a uniquely versatile, edible, and attractive alternative to spinach — especially for vertical farms.
If you’re experimenting with orache or dealing with alkaline water problems, Eutrema always invites growers to reach out for guidance.
And if you want cutting-edge fertilizers, biostimulants, and biopesticides designed for modern hydroponics, visit Eutrema.co.uk — where “standard” products are not part of the vocabulary.
Article by Dr Russell Sharp
If you would like to keep up to date with subjects just like this, you can listen to both our podcasts! Links can be found bellow:
Hydroponics Daily Podcast: https://podcasts.apple.com/us/podcast/hydroponics-daily/id1788172771
Cereal Killers Podcast: https://podcasts.apple.com/us/podcast/cereal-killers/id1695783663