
The Plant Doctor: Flowers on Brunfelsia shrub open purple, fade to violet and then turn white
Plant Doctor Tom MacCubbin addresses several common gardening questions, focusing on Brunfelsia shrubs, fruit ripeness, and poinsettia care. Regarding Brunfelsia, he explains their unique floral characteristic where flowers open purple, transition to violet, and then fade to white, often referred to as 'Yesterday, Today, and Tomorrow.' He advises planting them in full to partial sun with well-drained, acidic soil. Regular watering is recommended, especially during dry periods, and a light feeding with a slow-release granular fertilizer every two to three months from March through October. Pruning should occur after flowering to maintain shape and encourage new blooms. MacCubbin also notes that the plant is poisonous if ingested, making caution necessary around children and pets.
Another query concerns identifying when fruit, specifically from a star fruit tree, is ready for harvest. MacCubbin explains that star fruit is typically ready when it turns fully yellow, indicating it's sweet and juicy. However, he cautions that some fruits, like mangoes and avocados, are often picked green and allowed to ripen off the tree. He recommends consulting local agricultural extension services or reputable gardening guides for specific ripening indicators for different fruit types. General advice for fruit harvesting includes looking for changes in color, a slight softening, and an aroma indicating maturity.
Finally, MacCubbin provides guidance on what to do with a Christmas poinsettia after the holiday season. He suggests keeping the plant in a bright location indoors and continuing regular watering. Once the danger of frost has passed, usually in spring, the poinsettia can be moved outdoors to a partially shaded spot. He advises pruning it back to about half its height to encourage bushier growth. For the plant to color up again for the next Christmas, it requires a strict schedule of 12-14 hours of complete darkness daily for about eight weeks starting in early October. This photoperiod manipulation is crucial for the bracts to change color.
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