Can Blueberries Cross Pollinate With Blackberries

Can Blueberries Cross Pollinate With Blackberries?

Blueberries cannot cross pollinate with blackberries because they belong to completely different plant genera.
 
Blueberries are in the genus Vaccinium, while blackberries belong to the genus Rubus.
 
Even though both produce tasty berries and both thrive in many of the same home gardens, they are not closely related enough for cross pollination to happen.
 
The idea of blueberries cross pollinating with blackberries comes up often among gardeners who grow both side by side.
 
It’s a fair question, but the answer is pretty clear once you understand the science.
 
In this post, we’ll dig into why blueberries cannot cross pollinate with blackberries, what cross pollination actually requires, and how to pollinate each of these berries properly so they produce their best fruit.
 
Let’s get into it.
 

Why Blueberries Can’t Cross Pollinate With Blackberries

Blueberries can’t cross pollinate with blackberries, and the reasons come down to basic plant biology.
 
Here’s what’s really going on.
 

1. They Belong to Different Plant Families

For cross pollination to happen, plants generally need to be in the same genus, or at least closely related species.
 
Blueberries are part of the Ericaceae family, also known as the heath family.
 
Blackberries belong to the Rosaceae family, which is the rose family.
 
That’s a huge genetic gap.
 
It’s like asking if an apple can cross pollinate with a rose bush just because both look nice in a garden.
 
The genetic incompatibility means pollen from a blueberry plant simply won’t fertilize a blackberry flower, no matter how hard bees try.
 

2. Their Flowers and Pollen Are Structurally Different

Even if the plants were related, cross pollinating blueberries with blackberries would run into a physical problem.
 
Blueberry flowers are shaped like little bell-shaped urns with pollen that’s released through pores.
 
Blackberry flowers are open and flat, with pollen that’s easily accessible to insects.
 
The pollen grains themselves are different sizes and shapes, so they don’t match up with the flower structures of the other plant.
 
Cross pollinating blueberries and blackberries would be like trying to fit a square peg into a round hole.
 
It just doesn’t work at the cellular level.
 

3. Cross Pollination Requires Compatible Chromosomes

For any successful cross pollination to occur, the chromosomes of the pollen and the egg need to match up properly.
 
Blueberries have a different number of chromosomes than blackberries.
 
When blueberries cross pollinate with other blueberries, the chromosomes align perfectly and seed development can begin.
 
But when blackberries cross pollinate with blueberries, the genetic material can’t pair up.
 
This means even if pollen landed on the wrong flower, nothing would come of it.
 
No seeds, no fruit, no hybrid berry.
 

What Cross Pollination Actually Requires

Cross pollinating blueberries with blackberries isn’t possible, so it helps to understand what real cross pollination looks like.
 
Here’s the breakdown.
 

1. Same Species or Close Relatives

For cross pollinating blueberries with other blueberries, you need two different varieties of the same species.
 
For example, a ‘Bluecrop’ blueberry can cross pollinate with a ‘Chandler’ blueberry.
 
They’re different cultivars, but they belong to the same species, so their pollen is compatible.
 
That’s why planting two different blueberry varieties together boosts fruit production.
 

2. Overlapping Bloom Times

Timing matters for blueberries cross pollinating with other blueberries.
 
Both varieties need to be blooming at the same time for bees to move pollen from one to the other.
 
If one blueberry bush finishes blooming before the other starts, cross pollination won’t happen.
 
So when you plant blueberries for cross pollination, pick varieties with similar bloom windows.
 

3. A Reliable Pollinator

Blueberries need buzz pollination, which is performed by bumblebees and certain native bees.
 
These bees vibrate their flight muscles to shake pollen loose from the blueberry flower.
 
Without these specific pollinators, cross pollinating blueberries becomes much harder.
 
Blackberries, on the other hand, attract honeybees and other general pollinators because their flowers are more open.
 
So the pollinators for blueberries and blackberries are often different, which further reduces any chance of cross pollination between the two.
 

How to Pollinate Blueberries and Blackberries Correctly

Since cross pollinating blueberries with blackberries won’t work, focus on getting each plant pollinated properly on its own.
 
Here’s how.
 

1. Plant Multiple Blueberry Varieties Together

To pollinate blueberries, plant at least two different varieties that bloom at the same time.
 
Good pairs include ‘Bluecrop’ with ‘Blueray’ or ‘Duke’ with ‘Chandler’.
 
This ensures cross pollinating blueberries happens naturally, giving you bigger and more abundant fruit.
 

2. Encourage Bumblebees in Your Garden

Bumblebees are the best pollinators for blueberries.
 
Plant flowers like lavender, borage, and salvia nearby to attract them.
 
Avoid pesticides, especially during bloom time, because they can wipe out the very pollinators you need for cross pollinating blueberries.
 

So, Can Blueberries Cross Pollinate With Blackberries?

Blueberries cannot cross pollinate with blackberries because they belong to different plant families and have incompatible pollen and flower structures.
 
Blueberries cross pollinate with other blueberry varieties, while blackberries cross pollinate with other blackberry varieties.
 
Cross pollinating blueberries with blackberries isn’t a thing, and no hybrid berry will ever come from trying.
 
Instead, plant compatible varieties of each berry, support the right pollinators, and you’ll get plenty of fruit from both.