Here’s A Plum Variety Producing Compact Trees The Perfect Size For The Patio. Opal Is One Of The Best flavoured Early Plums Which You’ll Be Enjoying From Those Late Summer Days In September.grown On Roots To Restrict Their Height To 28in 70cm They Produce Lots Of Fruit At A Height For Easy picking.how Your Plants Arriveyou Receive Our Plum Trees As Young Specimens Growing Strongly And Sturdily And Primed To Produce Lots Of Plums For You.they Arrive As A Main Stem Studded With Buds With Lots Of Growing Potential In Spring.the Roots Are Covered In A Pot In A Polythene Bag To Keep The Roots Perfectly Humid While Transported From Our Nursery To Your Home.when They First Go In The Ground