Larkspur (lat. Delphinium) is actually a very easy-care plant - provided the site conditions are right. The perennial also belongs to the strongly consuming garden plants, i. H. it should be supplied with nutrients regularly. Otherwise, growth and flowering will be rather puny, and the leaves will turn yellow.
A lack of nutrients can be the reason why delphinium develops yellow leaves
Unsuitable location
A common reason for yellowing leaves is the wrong location. Larkspur loves full sun, but needs loose, humus-rich and therefore nutrient-rich and moist soil. In particular, the perennial does not like a place that is too shady or too firm - perhaps very loamy - soil. In such a case, transplanting or improving the soil with plenty of compost will help.
Larkspur suffers from nutrient deficiencies
Furthermore, yellow leaves are very often a sign of nutrient deficiency, for example because you have not fertilized the delphinium sufficiently. If this is the case, provide the plant with readily available fertilizer, such as a liquid fertilizer. Compost and other organic fertilizers are not suitable in this case because they have to decompose first.
tips and tricks
However, a nutrient deficiency can also occur as a result of root rot due to waterlogging. Although delphinium needs a lot of water, it does not tolerate wet "feet". In such a case, the plant can usually no longer be saved.