How to Make a Wisteria Bloom With Potash
- 1). Sprinkle the sulfate of potash on the soil around the base of the wisteria. Use 1 ounce per square yard.
- 2). Use a rake to scratch the potash into the top 1/2 inch of soil.
- 3). Water the fertilized area to a depth of 8 inches. This will help soak the potash down to the wisteria's roots.