Annual lobelia is considered a heavy feeder that can benefit from periodic feeding throughout the growing season. The soil should be amended with compost at the time of planting to give lobelia a nutrient boost. As the plant matures, a balanced liquid fertilizer will promote healthy growth. Perennial Cardinal Flower is native to North America and does not have high fertilizer needs like the annual types but also benefits from occasional fertilizer.
How to Fertilize Lobelia
Lobelia benefits from a layer of compost at the time of planting and then one or two feedings per month in the growing season. Fertilizer for lobelia should be applied around the root zone of the plant. Apply fertilizer after thoroughly watering your plants to prevent root burn. Follow the package direction of your fertilizer for the correct application rate and method.
Lobelia prefers slightly acidic soil with a pH between 5 and 6. You can test your soil through your local extension office for comprehensive pH and nutrient profiles.
Best Time To Fertilize Lobelia
Adding compost at the time of planting is a good way to enrich the soil. As the organic material breaks down, it will slowly release nutrients for the lobelia to absorb. Do not apply other fertilizers at the time of planting.
The best time to start fertilizing is 3 to 4 weeks after planting. Lobelia plants can be fertilized once or twice a month throughout the growing season beginning in late spring. Fertilizer should not be applied during the peak heat of the day and should be applied in the morning or evening.
Best Fertilizer For Lobelia
Compost is a natural slow-release fertilizer that helps to build the soil when planting. If you do not have compost, you can use a slow-release granular fertilizer with a 5-10-10 or 5-10-5 NPK ratio at the time of planting.As the plant matures, switch to an all-purpose, water-soluble or liquid fertilizer. Liquid fertilizers make a great choice for regular applications during watering. Choose a fertilizer specifically made for flowering plants with a higher amount of phosphorous if you want to promote blooming.
Lobelia Fertilizing Tips
- Do not apply fertilizer until lobelia has had time to settle
- Apply fertilizer after watering to avoid root burn
- Use a balanced liquid fertilizer or a formula made for flowering plants
- Fertilize once or twice a month until frost
Warnings
-Always wear protective gloves and a face mask when handling chemical fertilizers.
-Closely follow all directions and storage guidelines that are on the fertilizer label.
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Author Katie Endicott - Published 9-14-2022 |