Getting it to bloom
Why won't my Rustica Rubra magnolia bloom? (and how to make it flower)
Also called Rustica Rubra magnolia, Rustica Rubra saucer magnolia (Magnolia × soulangeana 'Rustica Rubra').
More about rustica rubra magnolia
About Rustica Rubra magnolia
Magnolia × soulangeana 'Rustica Rubra' · also called Rustica Rubra magnolia, Rustica Rubra saucer magnolia · flowering
'Rustica Rubra' is one of the finest Magnolia × soulangeana cultivars, bearing large, goblet-shaped flowers in rich rosy-purple to ruby-red, slightly deeper and later-flowering than most saucer magnolias. A vigorous, multi-stemmed deciduous shrub or small tree, it blooms prolifically in mid-spring on bare branches. An RHS Award of Garden Merit holder prized for colour intensity and frost resilience of blooms.
Plant type: flowering
Watch for — Late frost damage to flowers: The most common disappointment — early-opening flowers are blackened or browned by late frosts. 'Rustica Rubra' flowers slightly later than other saucer magnolias, offering marginally better frost evasion. Siting against a north- or east-facing wall slows bud development, further reducing frost risk. Cannot be controlled once blooms are open; fleece young trees if a hard frost is forecast during flowering.
The reasons rustica rubra magnolia isn't blooming
Almost every non-blooming rustica rubra magnolia traces back to one of these, roughly in order of how common they are:
- Too little sun — most of these need full sun (or very bright light) to flower well; shade gives leaves, not blooms.
- Too much nitrogen feed, driving lush foliage at the expense of flowers (very common with general or lawn feeds).
- The plant has not been deadheaded, so it stops flowering once it sets seed.
- Irregular watering — drought or waterlogging at the budding stage makes buds abort.
- It is still too young or was checked by a transplant and is rebuilding before flowering.
Feeding rustica rubra magnolia a high-nitrogen general feed and growing it in too little sun — you get a big leafy plant and almost no flowers.
The fix — how to get rustica rubra magnolia to flower
- Maximise sun. Give rustica rubra magnolia the sunniest spot you have — for most bedding and fruiting plants, more direct light directly means more flowers.
- Switch the feed. Move off high-nitrogen feeds and use a higher-potassium "bloom" or tomato-type feed as it comes into flower.
- Deadhead regularly. Remove spent flowers often to keep it producing more rather than stopping to set seed.
- Water consistently. Keep moisture even through budding and flowering — drought-then-flood swings make buds drop.
Light and feeding do most of the heavy lifting here. Dial in the spot with the light guide for rustica rubra magnolia and get the feeding right with the rustica rubra magnolia fertilising schedule — the wrong feed (too much nitrogen) is one of the most common silent reasons a healthy plant makes leaves instead of flowers.
Bloom season and what to expect
Rustica Rubra magnolia flowers across its growing season (mostly summer) and, kept fed and deadheaded, can bloom for many weeks or right up to frost.
Post-bloom care so it flowers again
Deadhead, keep feeding lightly, and many will rebloom; collect seed from the best plants at the end of the season if you want to grow them again.
For everything else this plant needs day to day, see the full rustica rubra magnolia care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.
Rustica Rubra magnolia blooming — frequently asked questions
Why won't my rustica rubra magnolia flower?
Rustica Rubra magnolia blooms on the season's growth given enough sun, warmth and the right feed — there is no cold or photoperiod trick, just good growing conditions and a bloom-leaning feed. The most common reason it is not happening: Too little sun — most of these need full sun (or very bright light) to flower well; shade gives leaves, not blooms.
How do I make rustica rubra magnolia bloom?
Give rustica rubra magnolia the sunniest spot you have — for most bedding and fruiting plants, more direct light directly means more flowers. Move off high-nitrogen feeds and use a higher-potassium "bloom" or tomato-type feed as it comes into flower.
When does rustica rubra magnolia normally bloom?
Rustica Rubra magnolia flowers across its growing season (mostly summer) and, kept fed and deadheaded, can bloom for many weeks or right up to frost.
What should I do with rustica rubra magnolia after it flowers?
Deadhead, keep feeding lightly, and many will rebloom; collect seed from the best plants at the end of the season if you want to grow them again.
What is the single biggest mistake stopping rustica rubra magnolia flowering?
Feeding rustica rubra magnolia a high-nitrogen general feed and growing it in too little sun — you get a big leafy plant and almost no flowers.
Keep reading
- Rustica Rubra magnolia care — the full brief (light, water, humidity, problems, pet safety)
- Rustica Rubra magnolia light needs — usually the first thing to fix for flowers
- Rustica Rubra magnolia fertilising — the right feed for buds, not just leaves
- Should I water my plant? The simple check
- Why is my plant wilting? Wet vs dry
- Underwatered plant — signs and rehydration
- Why won't my peace lily bloom?
- Why won't my jade plant bloom?
- Why won't my tomato bloom?
- All 2566 bloom guides in the Growli library