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Tuscan Blue Rosemary Won't Bloom

Tuscan Blue rosemary (Rosmarinus officinalis "Tuscan Blue") is a variety prized not only for its fragrance and its many kitchen and home uses, but also for its deep blue blooms that show up in late winter and can last several months. If it does not bloom after its first year from being transplanted or more than three years from germination, there may be problems with the planting site.
  1. Problems

    • Rosemary thrives in full sun. One of the issues you'll find if it grows in shade is a lack of overall growth, including a lack of flowers. Tuscan Blue rosemary is no exception. Soggy soils encourage root rot, and one of the first symptoms of the decline of the whole plant may be a lack of flowering. While rosemary can survive in poor soils, severe nutrient deficiency in the soil may mean no raw materials for rosemary to use to produce flowers.

    Solutions

    • Transplant rosemary into an area with full sun, or simply move the container if they're planted in pots. Keep in mind that young plants only get bigger and cast shade on a wider area, so plant rosemary outside of a young tree's mature range of foliage, not it's current one. Root rot in rosemary is difficult to overcome, but drenching the roots in an anti-fungal agent and then re-planting in well-drained soil may work. If the soil lacks fertility, top-dress the surrounding soil with a layer of compost.

    Caution

    • Rosemary plants, including Tuscan Blue, often go into shock when transplanted. Move as much of the root ball as possible with the plant when transplanting. While rosemary don't like soggy soils, even they can dry out in a long drought. Water once a week to twice a month depending on the severity of the drought.

    Considerations

    • Transplanting and amending the soil rarely produces quick results. The Tuscan Blue rosemary may need several months to recover, especially if it has been in a bad site for a long time. The bush may not bloom again until the following year. Fall and spring are the best times to transplant, since there is the least amount of temperature stress during these times.