When Do Roses Bloom?
In the warmest climates, roses can bloom practically year-round. For the rest of the country, the bloom period starts in spring about 6 weeks after rosebushes come out of dormancy and lasts through summer and sometimes into fall. Of course, the flowering period depends on the variety of rose you are growing, as well as your climate and growing conditions. Another key factor is what type of rose you are growing: once-blooming, repeat-blooming, or continuous-blooming.
Once-blooming roses showcase flowers just once during the growing season, peaking in spring.
Repeat-blooming roses also have a splashy introduction, usually later in spring. Then, after a lull, they have an encore, developing flushes of new flowers later in the season.
Continuous-blooming roses like the popular Knock Out are a fairly recent development, having arrived roughly a quarter century ago when the cultivation of roses dates back thousands of years before that. While they are technically repeat bloomers, continuous-blooming roses differ in that they tend to bear fairly heavily all growing season without a noticeable lapse in production.
How to Extend Rose Bloom Times
Want to keep those spectacular blooms coming? Here are some tips to keep roses blooming as long as possible in your garden.
1. Plant a Succession of Blooms
If space allows, include once-blooming roses like climbers and ramblers, then add in a few repeat- or continuous-blooming roses to carry through the rest of the season.
2. Water Consistently
Keep rosebushes well-watered during the growing season. In times of drought, roses stop blooming as a way to conserve moisture. Irrigate at the base of plants to avoid wetting foliage, which can encourage plant diseases like black spot. Another option is to water in the morning so leaves can dry more quickly as the day warms up.
3. Prune Properly
Selectively pruning your roses opens up plant structure for better branch spacing. This not only encourages better air circulation to help prevent foliar diseases, it also allows sunlight to reach more of the plant, which promotes blooming.
4. Keep Up with Deadheading
On repeat-blooming roses, deadheading faded flowers prevents plants from spending energy on seed formation instead of new blooms. Cut back to a leaflet with 5 leaves, which is where new blossoms develop. Continuous-blooming roses do not need deadheading to encourage new blooms; however, you may wish to do it if bushes start to look untidy.
5. Seek the Light
Roses bloom best when given ample sunlight, so plant them where they will get 6 to 8 hours of sunlight per day. Generally, roses don't like to bloom when temperatures exceed 85°F for an extended period of time, so a bit of afternoon shade is welcome in the hottest climates.
6. Provide Good Soil
Roses do not like overly wet conditions, so avoid heavy clay soils. You want a good, loose, well-drained soil to promote healthy root growth. Add organic matter, such as compost, before planting and later as a mulch to conserve moisture and provide nutrients and beneficial microbes to the soil.
7. Fertilize Regularly
Roses are heavy feeders, so it's important to fertilize your roses at the right times. While shrub roses, climbers, and old garden roses need little fertilizing, hybrid teas, grandifloras, floribundas, polyanthas and miniatures will benefit from regular feeding.
Rose fertilizers are available in granular or liquid form. Some are quick release, some are slow release. Whichever you use, water the plants well the day before applying fertilizer as well as the day after. This will promote the most efficient uptake of nutrients.
8. Select Roses for Your Region
There are countless varieties of roses available, some better suited to certain climates and growing conditions than others. Check with your local cooperative extension for recommendations on the best roses for your area. The American Rose Society (ARS) can also be a helpful resource. When you grow the right variety for your climate, you will have a happier, healthier and more floriferous rosebush.
