The Queen Protea is a cut flower wonder. The flowers last for a very long time and look great in dried flower arrangements as well. Protea magnifica will become a large shrub, growing to 8-10 feet tall and wide. The Queen Protea is susceptible to frost and is tender when temperatures dip into the mid-20's. This Protea is one of those with lignotubers that allow regrowth even when the top is killed entirely. This is a fire adaptation that also works well with frost. The Queen Protea flowers are formed on second year wood and the plants hold their leaves for as much as 3 years so providing a good climate is important for having good looking plants. Protea magnifica also requires good drainage and will not do well in gardens that are boggy in the Spring.
The best time to sow is in fall or spring. Choose the season that gives the seedlings the most time to grow under favourable conditions. For example, if your summer is very hot and dry, but your winter is moderate and wet - sowing in autumn will give the seedlings a whole winter and spring to become strong before the harsh summer. In colder climates, it is best to sow in spring so that plants can become hardy before the frosts of winter.
Plant each seed in a 500 ml plastic seedling bag. Fill the bag with a well-drained acidic soil mixture with a pH of about 5.5. You can make the mixture out of : 2 parts coarse river sand, 2 parts peat or decomposed pine needles, and 1 part vermiculite or perlite. It is important that the soil mixture drains well. Water should run right through the filled tray, but the soil mixture should be such that it retains moisture and remains damp between waterings. The seeds/seedlings should never be allowed to dry out. The vermiculite helps retain moisture. It helps if the soil mixture is sterilised, ridding the soil of fungus, eggs, larvae and pathogens that might harm the seeds or the seedlings. The simplest method is to drench your soil mixture with boiling water before planting the seeds. This is best done on a flat, hard surface and has the added benefit of leveling out the soil. The drainage of the seed tray should ensure that after about 15 minutes, the soil is evenly damp. If there are any soggy patches or water pooled on the top, then your drainage is not sufficient. The boiling water kills germinating weed seeds, insect larvae, snail and slug eggs and fungal spores.