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Is this a miniature or full size mulberry? It looks like a 2 person job.There is a huge choice of large plant pots, if you google for "Planter" or "plant trough". And many of them are very expensive. Alternatives may be to use plastic storage boxes, which would need holes drilling in the bottom. And are usually rectangular. Wooden planters of the right size could be a DIY project out of scrap wood. And for really attractive homemade planters, there are several "hyper tufa" projects on youtube.Wooden barrels cut to size could fit the brief. I was also thinking of a large Belfast sink, although this may not be much bigger than you have already.Good luckhttps://www.ebay.co.uk/itm/112814695226
Alternatives may be to use plastic storage boxes, which would need holes drilling in the bottom. And are usually rectangular.
I tasted my first mulberry on Sunday, it was delicious! It was a fairly large tree in a walled garden. I'd love one and wish I'd known how nice they are when I was younger.
I grew mulberries (morus nigra) from seed 20+ years ago.I now have two trees which have started to bear fruit in the last couple of years. The berries are pleasant tasting but very small. I haven’t researched very thoroughly as to whether it’s standard to have such small berries from species trees as opposed to cultivars, but small the fruit certainly is. I’m happy to have the trees but if space is limited and expectations are high, then after a long wait there might be disappointment!