Can anyone recommend pollinators for a 'Jupiter' Triploid apple tree,
please?

Mine had plenty of blossom but only two fruits last year and none this
year. There are crabs not far away by the railway line (Ca 400yds) and
a Howgate Wonder and a Worcester Pearmain also close by (Within
throwing distance). The other nearest trees are young Falstaff and
Elstar, both in their first year of fruiting, about 250yds away.

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Cheers,
Compo