potentilla shrub not flowering - Knowledgebase Question

winthrop harbor, il
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Question by bergwiser
May 25, 2006
I have 6 potentilla shrubs surrounding my front porch that were planted approximately 3 years ago. I am not sure of the exact species of potentillas they are but they had little pink flowers on the plants when I purchased them and they were to bloom all summer long. The problem I am having is that they are only maybe getting 6 flowers on each shrub and that is only if I am fertilizing them with a liquid fertilzer every 2 weeks. The shrubs are in full sun the majority of the day. Is there something that may be added to the soil to help these shrubs to have more blooms and also to bloom through the summer as the tag said they would?

Answer from NGA
May 25, 2006
Potentilla shrubs bloom on new growth. Trim them back quite hard in early spring to remove winter damage and restore a symmetrical shape, taking off about two thirds of the plant. This should cause them to grow back dense and bushy and produce a strong flush of flowers in early summer. Once those flowers fade, trim the plant lightly to shear off the faded flowers. This should encourage rebloom later in the summer.

These plants do well in full sun and soil of average fertility. You may find they bloom better if watered deeply and slowly during dry spells so the soil never dries out completely. Flowering slows when summer temperatures turn hot, so some years you may have longer flowering than others.

You should not need to use a water soluble fertilizer on these shrubs. Instead, use a slow release or general purpose granular fertilizer per the label directions in early spring and again in early summer. Apply a top dressing of good quality compost in spring and early summer. Also use a two to three inch deep layer of organic mulch over the root area year round. This will help to feed the soil as it breaks down slowly over time.

You might also want to run some basic soil tests to make sure there is nothing severely lacking. Your county extension should be able to help with the tests and interpreting the results with an eye on growing potentillas. I hope this helps.

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