How to Grow Punarnava (Boerhavia) and Tell It From Its Twin (Video)

Transcript

That weed you pull could be punarnava. Can you spot its twin?

That weed you pull could be punarnava. Can you spot its twin?

Punarnava: The Lawn Weed

We'll show you how to grow this humble monsoon weed, and stay for the one test that separates it from its dangerous lookalike.

You Probably Already Have It

Here's the thing. Punarnava isn't some exotic plant you need to order online. It's that low, creeping weed that shows up on lawn edges, vacant plots, and dusty roadsides across the plains, especially after the monsoon rains. Most gardeners yank it out without a second thought. But once you learn to recognise it, you've basically got a free herb garden already started.

Spot the Real Punarnava

Now, the part most people miss. To identify punarnava, look at the stems first. They're long, trailing, often reddish or purplish, and swollen at the joints. Leaves grow in opposite pairs, but one leaf is clearly bigger than the other. Flowers are tiny, pink to purplish red, bunched on long thin stalks. But beware: a lookalike called horse purslane grows in the same spots, with juicy leaves and flowers pressed against the stem.

Beware the Lookalike

And this is where it gets interesting. Horse purslane, Trianthema portulacastrum, has been a long documented substitute in the herb trade, sold as bishkhapra in some markets. But it is not the same plant. The giveaway is the leaves: horse purslane has juicy, succulent leaves like purslane, and its flowers sit pressed right against the stem, not up on long stalks. Different plant, different story.

Three Ways to Start

Now, starting is easy. The fastest way is transplanting a wild plant. Pick one from clean ground, away from drains and roadsides. Water the spot the evening before, dig deep to keep the taproot, and pot it at the same depth in a sandy mix. Shade it four or five days; don't panic if it drops leaves. Cuttings work too; sowing sticky fruits in June or July works, though germination is patchy.

Built for 45°C Heat

Here's a number that surprised me: forty-five degrees Celsius. In places like Multan, Sukkur, and Bahawalpur, where summer hits forty-five and most herbs give up, punarnava keeps thriving. It's one of the few herbs that loves that kind of heat. Think about it, how many garden herbs can say they love a forty-five degree afternoon?

Where It Grows Best

Where does it grow? In Karachi and along the coast, it's easy all year. In Lahore, Faisalabad, and Delhi, it's easy too, but it dies back in cold weather and regrows from the root. In Islamabad and Peshawar, you get it from summer through autumn, but the tops die off in frost. Know your zone and plant accordingly.

Care: Less Is More

Care is laughably simple. Water only when the top three to four centimetres of soil are dry. In forty-five degree weeks, that means every day or two for pots; in winter, once a week or two. Soggy soil causes rot, so go sandy and free-draining. A handful of compost in spring and monsoon. Trim stems back by half to keep it compact.

When to Harvest

Pick leafy stem tips any time the plant is actively growing, but never take more than a third at once. In parts of India, people cook the young leaves as a saag. For roots, wait a year and dig after the monsoon. Digging ends that plant, so keep a few pots going. Wash well, dry in shade until brittle, and store in a closed jar.

A Word of Caution

Now the serious part. Swollen feet, puffiness, or reduced urine can signal heart, kidney, or liver problems. That needs a doctor, not a herb. If you have kidney or heart disease, take water tablets or blood pressure medicine, or you're pregnant or breastfeeding, ask your doctor before using punarnava in any form. Never harvest from roadsides or drains, and keep pets from grazing on it.

Grow It or Skip It?

So should you grow it? It depends. Grow it if you have a hot, sunny pot or basket and want a tough, low-water plant. Ideal for Multan and Sukkur, where most herbs give up. Skip it in a damp, shaded corner, or if sticky seeds on your pets annoy you. For the right spot, it's a no-brainer.

The One Test to Be Sure

And here's the one test I promised. In late monsoon, walk through a patch of these plants. If small sticky seeds hitch a ride on your shalwar or trousers, and the flowers sit up on long thin stalks, you've found punarnava. But if the plant has juicy, purslane-like leaves and flowers pressed flat against the stem, that's the lookalike. Walk away. This test settles it every time.

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Read the full guide

The full guide is on thecareonline.com. General information only, so check with your doctor for your own case.