Getting it to bloom

Why won't my Yellow Loosestrife bloom? (and how to make it flower)

Also called Yellow Loosestrife, Garden Loosestrife, Dotted Loosestrife (Lysimachia punctata).

More about yellow loosestrife

About Yellow Loosestrife

Lysimachia punctata · also called Yellow Loosestrife, Garden Loosestrife · flowering

Yellow Loosestrife is a vigorous herbaceous perennial producing upright stems clothed in whorled leaves and bright yellow star-shaped flowers in midsummer. It thrives in moist, partly shaded borders and pond margins, spreading freely by rhizomes. Excellent for naturalising in damp areas, though it can become invasive in wet habitats.

Plant type: flowering

The reasons yellow loosestrife isn't blooming

Almost every non-blooming yellow loosestrife 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 yellow loosestrife 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 yellow loosestrife to flower

Maximise sun. Give yellow loosestrife 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 yellow loosestrife and get the feeding right with the yellow loosestrife 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

Yellow Loosestrife 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 yellow loosestrife care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Yellow Loosestrife blooming — frequently asked questions

Why won't my yellow loosestrife flower?

Yellow Loosestrife 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 yellow loosestrife bloom?

Give yellow loosestrife 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 yellow loosestrife normally bloom?