Rosa xanthina, commonly called Yellow Rose or Manchu Rose, is a wild shrub rose that is native to open slopes and scrubby areas in central China. It typically grows on upright, arching canes to 6-9’ tall with a slightly larger spread. Reddish stems armed with reddish-brown thorns are clad with medium green leaves, each leaf having 7-13 small broad-ovate leaflets (to 1” long). Semi-double yellow flowers (to 2” diameter) appear for several weeks from late April into May in a dense bloom. Flowers are followed by attractive spherical to ellipsoid red hips that mature in late summer and persist on the shrub into winter. Best grown in organically rich, medium moisture, well-drained loams in full sun. Tolerates poor soils and some dryness. Also tolerates light shade, but best flowering and disease resistance generally occur in full sun. Water deeply and regularly (mornings are best). Avoid overhead watering. Good air circulation promotes vigorous and healthy growth and helps control foliar diseases. Summer mulch helps retain moisture, keeps roots cool and discourages weeds. Hardy in zones 5-9.
Growing Instructions for the Yellow Rose
The seeds have a period of dormancy. They can be planted outdoors in the fall or winter for spring germination or they can be cold stratified to simulate winter conditions and to break their dormancy at any time of the year. 1. Scarify the seeds by nicking or sanding the seed coat. The seeds can be sanded with sandpaper, a nail file or an emery board. 2. Soak the seed in water for 24-48 hours. 3. Place the seeds in a plastic bag and seal it. Store the bag in a refrigerator for 2 months. 4. After the stratification of the seeds, place the seeds in small, growing pots filled with pre-watered soil. A mix of garden soil and peat moss works well. Plant the seeds 1 inch apart, cover with 1/4 inch of soil and place in a sunny location. Be sure to keep the soil moist and never let it dry out as it can kill the seeds. 5. When the seedlings have at least two sets of leaves, they can be transplanted outside after the risk of frost has passed.