Does the portulaca sundial mix spread?

No, the portulaca sundial mix does not spread where the gardener does not wish it to as long as it is confined to beds and containers. The flowering native of Argentina, Brazil and Uruguay grows best in moist, well-drained soils with soil pH (power of hydrogen) levels between 5.5 and 6.2. It needs a temperature range between 65 and 72 degrees Fahrenheit (18 and 22 degrees Celsius).