[crashryan]

Is that blackberry jam on the cover?

Link to the book: The Skipper 002

[Captain Audio]

Is that blackberry jam on the cover?

One can only hope.
Actually it looks much like the droppings of birds that eat Blackberries.
Thats how the Blackberry reproduces in the wild. Birds eat the berries then poop out the seeds somewhere else.

There were once many black berry plants/bushes on my property.

[paw broon]

As huge amounts of blackberries are grown in Scotland, I have them with my porridge - not those excreted by birds, you understand . Actually, my brother in law makes excellent blackberry jam every year with foraged fruit. Really good on scones.

[The Australian Panther]

Ah, Blackberries!
The European colonizers of this island continent created environmental and biological havoc by insisting on importing European [read British] flora and fauna, to make it 'just like home' So Rabbits and Foxes [ for the Hunt dontya know?] Feral Pigs and Cats reap havok on native species and environments.  Roses and Daises and oh yes! Blackberries!  Imported plants thrive because they have no natural nemesis or predators so they become feral pests and have to be controlled by artificial means. Yes you can eat them, but get in before they are sprayed. I live in the country where most landowners need to control them. I even have some coming through the fence from my neighbors yard.
Did you know that 'blackberry is genetically variable, ie they are robust mutants, sort of plant Covid, if you like.
So there are more than 20 different cultivated varieties.

The European blackberry invasively crowds out native vegetation, pinches the water supply, promotes soil erosion, and provides food and shelter for pest animals like foxes and blackbirds.

There are 15 species of the weedy blackberry from Europe seen across South Australia.

Today the European blackberry is regarded as one of the worst weeds in Australia. 

 
And in my state,
https://www.environment.nsw.gov.au/topics/animals-and-plants/pest-animals-and-weeds/weeds/widespread-weeds/exotic-vines/blackberry

Ah, Blackberries!