Cant grow Birds of Paradise

Splicing works differently now. Here is a link with info: https://answers.ea.com/t5/Bug-Reports/BY-DESIGN-Splicing-doesn-t-produce-new-harvestable/td-p/6882771

You can also leave feedback here: https://forums.thesims.com/en_US/discussion/942707/evolving-too-slow-and-grafted-plants-not-happening-after-gardening-patch/p3