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Hi @Sayuru,
A 55cm pot will work for now, but it is on the smaller side if you want your weeping cherry blossom to thrive long term. These trees develop strong root systems and generally do better in larger containers closer to 70 to 100cm wide and deep. If you keep it in the current pot, make sure you have used a good quality potting mix designed for trees or shrubs and ensure the drainage is excellent. You will likely need to repot it every two to three years into fresh soil and eventually upgrade to a larger pot as the tree matures. Regular feeding is important in pots because nutrients wash out quickly, so use a slow release fertiliser for flowering trees and supplement with liquid feed during the growing season.
Planting in the ground would give the tree the best chance to flourish, but 1.5m from the house and close to a water supply pipe is not recommended. Even though ornamental cherries do not have roots as aggressive as figs or willows, their root systems can still extend well beyond that distance and may interfere with structures or pipes. If you cannot plant it further away, it is better to commit to growing it in a large container where you can control both the soil and the root spread.
To keep your new tree healthy, place the pot in a sunny spot, water it deeply but not too frequently so the roots do not sit in soggy soil, and mulch the surface to help retain moisture. Prune lightly each year to maintain its shape and remove any dead wood. Since you cannot plant it in the backyard due to your dogs, the container option is a safe and practical way forward, and with the right care your weeping cherry should still put on a beautiful display.
I'd keep an eye out at your local Bunnings for some half wine barrels. They make excellent planters for larger plants. We also have these Northcote Pottery 80cm Wine Barrels.
Please let me know if you have any questions.
Mitchell
