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Dill and cilantro can cross pollinate, but only under very specific conditions that don’t usually happen in a typical home garden.
Yes, these two herbs belong to the same plant family, which is why the question of whether dill and cilantro cross pollinate comes up so often.
They’re both in the Apiaceae family, along with carrots, parsley, and fennel.
That shared family tree means they have similar flower structures and reproductive habits, which makes cross pollination possible in theory.
In this post, we’ll look at whether dill and cilantro cross pollinate in real life, what has to happen for it to occur, and how to keep your seed supply pure if you’re saving seeds.
Let’s dig in.
Can Dill and Cilantro Cross Pollinate?
Yes, dill and cilantro can cross pollinate, but the reality is a bit more complicated than a simple yes or no.
Both plants are annual herbs that produce umbrella-like flower clusters called umbels.
Those umbels are packed with tiny flowers that release pollen and attract pollinators like bees, wasps, and hoverflies.
For dill and cilantro to cross pollinate, pollen from one plant has to land on the flower of the other while both are blooming at the same time.
That timing issue is the biggest hurdle.
Dill typically bolts and flowers in the heat of summer, while cilantro bolts fast in warm weather too, but the two don’t always sync up perfectly.
If they do bloom together, and pollinators are active, then yes, dill and cilantro cross pollination becomes a real possibility.
1. They Share the Same Plant Family
The main reason dill and cilantro can cross pollinate is that they belong to the same botanical family, Apiaceae.
Plants within this family often share similar flower shapes and reproductive timing.
That similarity makes it easier for pollen from one to fertilize the other.
It’s not a guarantee, but it opens the door for cross pollination to happen.
2. Both Are Open-Pollinated
Dill and cilantro are both open-pollinated plants, meaning they rely on wind and insects to move pollen around.
Open pollination is great for biodiversity, but it also means these herbs can’t control who their neighbors are.
If dill and cilantro are growing close together, insects can easily carry pollen from one to the other.
That’s one of the biggest reasons dill and cilantro cross pollinate when they’re planted side by side.
3. Overlapping Bloom Times Matter
Even though dill and cilantro can cross pollinate, it only happens if their bloom times overlap.
Dill usually flowers in mid to late summer.
Cilantro tends to bolt quickly in warm weather, often flowering earlier in the season.
If you can stagger planting or grow them in different spots, you can reduce the chances of dill and cilantro cross pollination.
What Happens If Dill and Cilantro Cross Pollinate?
If dill and cilantro do cross pollinate, the results show up in the seeds, not the current plants.
The leaves you harvest this season will still taste like dill or cilantro, depending on which plant you picked from.
The cross only affects the next generation grown from those seeds.
So if you save seeds from a dill plant that got pollinated by cilantro, the offspring could be a weird hybrid with unpredictable flavor.
That’s why seed savers work hard to prevent dill and cilantro cross pollination in their gardens.
1. Flavor Gets Unpredictable
A dill-cilantro hybrid won’t taste like either herb in a reliable way.
You might get something that leans toward dill, something that leans toward cilantro, or something that tastes like neither.
For anyone who cooks with these herbs, that unpredictability is a real downside.
2. Seed Purity Is Lost
If you’re saving seeds to replant next year, cross pollination ruins the genetic purity of your stock.
Heirloom varieties depend on isolation to stay true to type.
Once dill and cilantro cross pollinate, those saved seeds are no longer reliable.
3. The Current Crop Is Fine
The good news is that the plants you’re growing right now are unaffected.
Cross pollination only changes the seeds they produce.
So you can still enjoy fresh dill and cilantro all season long, even if they cross pollinate.
How to Prevent Dill and Cilantro Cross Pollination
If you want to keep your dill and cilantro from cross pollinating, a little planning goes a long way.
The goal is to keep their blooming periods apart or physically separate them so pollinators can’t do the deed.
Here are the most effective strategies.
1. Plant Them Far Apart
Distance is your best defense against dill and cilantro cross pollination.
Experts recommend keeping plants that might cross pollinate at least 100 feet apart, though some say even more for absolute purity.
In small gardens, that’s not always possible, so you’ll need other tricks.
2. Stagger Your Planting Times
Since dill and cilantro cross pollinate mainly when their bloom times overlap, you can plant them at different times.
Sow cilantro early in spring so it flowers before dill does.
Or plant dill later so it blooms after cilantro has finished.
Staggering keeps their flowering windows from colliding.
3. Use Physical Barriers
Row covers or fine mesh netting can keep pollinators away from your herbs.
If insects can’t reach the flowers, dill and cilantro cross pollination won’t happen.
Just remember to remove the covers if you want the plants to self-pollinate naturally.
4. Cut Flowers Before They Open
If you’re not saving seeds, just snip off the flower heads before they open.
That stops the pollination process entirely and keeps your herbs focused on leaf production.
It’s the simplest way to avoid dill and cilantro cross pollination without any fuss.
5. Grow Only One at a Time
If you really want to save seeds, grow dill one year and cilantro the next.
That way, there’s zero chance of dill and cilantro cross pollinating.
It’s a slow approach, but it guarantees pure seed stock.
So, Can Dill and Cilantro Cross Pollinate?
Dill and cilantro can cross pollinate, but it only happens when their bloom times overlap and pollinators are active.
The current plants stay true to type, and only the seeds carry the mixed genetics.
If you’re saving seeds, keep dill and cilantro apart or stagger their planting to avoid surprises.
If you’re just growing them for fresh herbs, don’t worry too much, because the leaves you harvest will still taste exactly like dill and cilantro should.