Kingsfoil, aye, it's a weed.

You got any more weed?

Cool pollen, though.

So if you think of cancer as a weed, we often can whack the weed away.

I'm allergic to pollen.

That's a geranium pollen.

A different pollen signature, if you like, or a different pollen fingerprint.

These plants are resistant to weed killers.

Tom has a pollen allergy.

I am allergic to pollen.

This weed killer does not harm human beings.

I have an allergy to pollen.

He pulled up the weed and threw it away.

Jandi or Japcho ( lawn or weed ), that girl's expression...

But pollen forensics can be very subtle.

Perhaps there's more pollen in the city.

They get paid by pollen and nectar, to move that male sperm, the pollen, from flower to flower.

Oh, we weed their footprint when they are still in infancy?

Pollen is produced by the anthers of flowers.

But anyway, take a look at its pollen.

Now, pollen from plants, which are wind dispersed

The fossilized pollen was not of savanna vegetation.

I'm thinking of the best way to completely crush that little weed.

During that two months, if we have weeds, we weed them out.

I plant the potatoes, I weed the garden, I domesticate the species.

And of course, they're made to carry this pollen.

Pollen is a flower's way of making more flowers.

So, that's 20 micrometers across, that pollen grain there.

But not all pollen is quite so simple looking.

Like I said, pollen carries the male sex cells.

They build up a static electric charge and the pollen jumps on them and helps spread that pollen from bloom to bloom.

What is a weed? A plant whose virtues have not yet been discovered.

Ben Weatherstaff rooted up a weed and threw it aside before he answered.

Problems from weeds, weed control, cost Montana nearly 200 million dollars a year.

You weed down through various steps that cause many of these to fail.

First of all, pollen is tiny. Yes we know that.

The pollen has little barbs on it, if we look.

That tells me that it's actually been fossilized, this pollen.

Just how well can masks block the, even smaller than pollen, yellow sand dust? I think it much more of a nuisance than pollen.

Here is a scanning electron micrograph of a grain of pollen.

Now the way that plants transmit that information is through pollen.

With the trains coming in to urban hubs, they can carry pollen with them, very light pollen, and it's just a big supermarket in the city.

These are little bits of individual grain of pollen there and there, and here is a what you see as one little yellow dot of pollen, when you look in a microscope, it's actually made of thousands of little grains of pollen.

That means they can't the pollen in their bloom can't fertilize themselves.

These are little bits of individual grains of pollen there and there.