There are male and female flowers, not male and female trees, if I am not mistaken, but I claim no expertise on the subject, so hopefully will be corrected, if I am wrong.
I have not researched the exact mechanism of pollinating in non-self-fruitful ones because I have planted single self-fruitful trees.
However, you need to buy them in 2 fruit producing varieties: "When planting self-unfruitful cultivars, at least two different sweet cherry varieties must be planted for fruit production."
Thanks, guys... the link given in the first response (thanks @Dovefromabove ) is very clear on which trees are needed to pollinate others, and which self-fertilise.
@Janie B I have a dessert cherry, Stella and a cooking cherry Morello. Pay special attention to the rootstock to suit your proposed orchard area. Both are prolific, though it takes a few years for them to yield well. We usually gather the ones within reachable height and leave the rest for the birds.
Oxford. The City of Dreaming Spires.
And then my heart with pleasure fills,
And dances with the daffodils (roses). Taking a bit of liberty with Wordsworth
Thanks, @Eustace , Stella is definitely on my list... seems to be the most reliable of all of them... the other two will be one of Penny, Sweetheart, Sunburst or Summer Sun I think. Not going to go for a cooking one ... I just want them to eat fresh by the bowlful!
To clarify for those who are interested … the cross -fertilisation of fruit trees is nothing to do with gender … each cherry flower contains both male and female parts.
However some varieties of orchard fruit have become self-sterile through hybridization … and these require the pollen of at least one other variety (sometimes two) of the same species in order to become fertilised.
When choosing varieties that will cross-fertilise each other, coinciding time of flowering is vital.
Always worth considering going for AGM awarded cultivars. The below page lists them by fruiting time and had a lot of useful information on growing them.
Posts
https://hortnews.extension.iastate.edu/faq/do-i-need-plant-more-one-cherry-tree-pollination-and-fruit-set
https://www.chrisbowers.co.uk/category/cherries/?stpos=25
https://www.chrisbowers.co.uk/article/self-fertile-cherries--the-best-6-cherry-trees-for-your-garden/
I live in west central Scotland - not where that photo is...
However, you need to buy them in 2 fruit producing varieties: "When planting self-unfruitful cultivars, at least two different sweet cherry varieties must be planted for fruit production."
To clarify for those who are interested … the cross -fertilisation of fruit trees is nothing to do with gender … each cherry flower contains both male and female parts.
https://www.avasflowers.net/blog/how-flowers-become-fruit/
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
https://www.rhs.org.uk/fruit/cherries/grow-your-own
When you don't even know who's in the team
S.Yorkshire/Derbyshire border