Q.Planting time of year
Ordered and received small pink splash weigela today with instruction to plant immediately! I live in Ohio, this is Sept., will it die over the winter?

Plant ASAP in soil that you have enriched with compost and/or sphagnum peat moss. Water well. Roots continue to settle in until the ground freezes so you have time. Don't let the soil dry out all the way through to the ground freezing. Roots that are low in moisture are subject to winter kill. When it goes dormant (I'm assuming you did not get a bare root plant) and leaves fall, cover the base and immediate surrounding area with several inches of wood mulch, straw or shredded/chopped leaves. This is only necessary the first year. It helps to prevent freeze and thaw cycles that can heave a new planting. Enjoy your new weigela.
https://www.gardeningknowhow.com/.../weigela/growing-weigela.htm