Primrose (Primula) comes in an array of bright colours, with yellow, red, pink, blue or orange blossoms. These cheery flowers provide winter colour and grow indoors as houseplants. To keep your primrose happy indoors, provide it with adequate water and light. These plants are not meant to last forever, but they can last through the winter months with the right care.
Plant primrose in a container with drainage holes. Cut a small piece of mesh screen to slip in the bottom of the container. This prevents soil from washing out of the bottom of the container every time you water the primrose. Fill the container 1/3 to 1/2 of the way full with potting soil. Remove your primrose from its plastic container and break apart the root ball with your fingers. Place the primrose in the container, then fill the container the rest of the way with soil. Water the container to settle the soil around the plant; water until you see liquid come out the drainage holes at the bottom of the container.
Use a balanced, sterile potting soil for growing primrose plants indoors. To make your own potting mix, the American Primrose Society recommends 4 parts of mineral-rich soil, or garden soil, 4 parts of coconut fibre and 2 parts of perlite.
Place primrose in a south or southeast facing window where it can receive ample sunlight. Primrose plants prefer morning sun to afternoon sun. If plants grow leggy and weak, they're receiving too little light. If plant leaves turn yellow, your primrose may be receiving too much sun. If you don't have enough windows, provide your primrose with an incandescent or fluorescent plant light for 12 hours a day.
Allow primrose plants to dry out mostly, but not entirely, between waterings. Primrose likes moisture but dislikes wet feet or roots. To test the soil's moisture content, stick your finger down into the soil or stick a pencil into the soil. If the soil feels wet, hold off watering until the soil feels just slightly moist, cool and not soggy, to the touch, or until the pencil comes free from the soil with no dirt. Then add water until liquid flows from the drainage holes at the bottom of the container and the soil becomes saturated.
When grown indoors, primroses prefer cool rooms that don't fluctuate in temperature. They dislike hot environments and will do poorly in winter in heated homes. Place primroses in a draft-free area where the plant will not overheat, such as an entryway, mudroom or enclosed porch. The American Primrose Society recommends temperatures of 10 to 18.3 degrees Celsius for your primrose plant.
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