Crepe Myrtle Fertilizer for Summer Blooms

Crepe Myrtle Fertilizer

4.6 · 317 reviews

Crepe myrtles leaf out late, grow fast through early summer and flower on that new growth from midsummer on, so the early-season flush is the one to support. Our liquid Crepe Myrtle Fertilizer supplies the nutrients that growth uses, for trees in the landscape and large containers, by watering can or hose-end sprayer.

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When your crepe myrtle may benefit from feeding

When your crepe myrtle begins producing new shoots and leaves during its warm active-growth period

When a container crepe myrtle is preparing new growth after its potting mix has become nutrient-poor

When soil testing shows a nutrient need while your plant has adequate full sun for flowering

When your established crepe myrtle has healthy roots but low nutrient availability during the summer growing period

Few flowers don't necessarily mean insufficient fertilizer. Full sun, pruning, and growing conditions may matter more; too much nitrogen can encourage leaves instead of flowers.

Results you can see

Supports fuller, more colorful blooms for a healthy and beautiful crepe myrtles.

Stem development for a fuller, thriving tree.

Supports healthy root development for better water and nutrient uptake.

How to use

Watering can

2 Tbs (30 mL) per gallon of water

Spring & summer: every 1–2 weeks · Fall & winter: every 4 weeks
Hose end sprayer

Set dial to 1 oz (30 mL) setting

Spring & summer: every 1–2 weeks
Leaf misting (optional)

1 tsp per quart (32 oz) of water

Every 1–2 weeks

What's inside

The 3.6-3-5.1 ratio is built around a key fact: crepe myrtles bloom on new wood, so the growth they put on this season is what carries this season's flowers. Nitrogen at 3.6% fuels that new growth, and potassium at 5.1% — the highest of the three — supports the flowering itself along with root and branch strength. All of the nitrogen is nitrate nitrogen, the form roots absorb directly, so response is fast and burn risk stays low.

Beyond NPK: sea kelp (Ascophyllum nodosum) for natural growth compounds, plus calcium at 2.1% — unusually high, and what strengthens new wood and roots — magnesium (0.75%), iron, manganese, zinc, boron, and copper. These keep foliage deep green and support the sustained energy a crepe myrtle needs to bloom for months rather than a single short flush.

How to care for crepe myrtles

Light

Give crepe myrtle full sun for the strongest flowering and a dense canopy. Plants in too much shade often make fewer blooms and weaker growth. Strong sun lets your tree make better use of water and nutrients during its active summer season.

Water

Water newly planted trees deeply and consistently while roots establish. Established crepe myrtles are more drought tolerant but still benefit from deep watering during extended dry periods, especially while actively growing and flowering.

Soil

Use well-drained soil and avoid locations that remain soggy. Healthy roots support both canopy growth and flowering. If a tree is struggling because of poor drainage or root stress, more fertilizer is unlikely to solve the problem.

Feeding

Feed Crepe Myrtle Fertilizer every two to four weeks from bud break in spring through midsummer, then stop so new growth hardens off before cold weather. That nutrition supports new shoots, foliage, roots, and flowering growth. Avoid heavy nitrogen feeding, which drives excess leaves and shoots.

Pruning

Prune selectively to remove dead, rubbing, or poorly placed branches and to maintain a natural structure. Avoid severe topping, often called crepe murder, because it creates weak shoots and an unnatural canopy rather than better flowering.

Summer blooms

Crepe myrtle flowers on new growth, so healthy spring development supports the summer display. Full sun, balanced nutrition, and sensible pruning all contribute. Our fertilizer supports flowering growth but does not replace the need for strong light.

Frequently asked questions

How can I help my crepe myrtle produce more summer blooms?

Appropriate nutrition supports the new growth on which crepe myrtles flower, but strong sunlight is especially important for good blooming. Feed to support healthy active growth rather than applying excessive fertilizer in an attempt to force additional flowers.

How do I fix a crepe myrtle that's growing lots of leaves but barely blooming?

Insufficient sunlight or too much nitrogen can encourage leafy growth without a strong flower display. Before adding more fertilizer, make sure your tree receives adequate sun and isn't already being overfed.

When should I fertilize my crepe myrtle?

Feeding around the start of active spring growth can provide nutrients for developing leaves, stems, roots, and flowering growth. Avoid unnecessarily heavy feeding later in the season.

Can fertilizer help a young crepe myrtle establish and grow?

Appropriate nutrition can support normal root and shoot development, but consistent watering and proper planting are especially important while a young tree establishes. Avoid trying to accelerate establishment with excessive fertilizer.

How do I fertilize a crepe myrtle without causing excessive leafy growth?

Follow the recommended application rate and avoid repeatedly adding fertilizer just because your tree is growing. Overfeeding—particularly with nitrogen—can encourage excessive vegetative growth, which isn't necessarily beneficial for flowering or structure.