Grin and Tonic™ Reblooming Hydrangea

Grin and Tonic™ is hardy in USDA zones 5 to 9 and performs best in part sun — morning light with protection from harsh afternoon heat. Like all bigleaf hydrangeas, it wants rich, consistently moist but well-draining soil, and you can steer the bloom color by adjusting soil pH.

Planting

1. Choose a spot with morning sun and afternoon shade; too much hot, direct sun causes wilting and faded blooms.
2. Work in compost or other organic matter to create rich, well-draining soil. For blue flowers aim for acidic soil; for pink, keep it more alkaline.
3. Dig a hole about as deep as the root ball and twice as wide.
4. Set the plant so the top of the root ball sits level with the surrounding soil, then backfill and firm gently.
5. Water in thoroughly and spread 2 to 3 inches of mulch over the root zone, keeping it pulled back from the stems.

Care & maintenance

• Water. Keep the soil evenly moist, especially in the first season and during summer heat. Bigleaf hydrangeas wilt quickly when dry; deep, regular watering keeps blooms full.
• Feed. Apply a balanced or bloom-type fertilizer in spring as growth begins; a second light feeding in early summer supports rebloom. Avoid heavy late-season nitrogen, which pushes leaves at the expense of flowers.
• Light. Part sun is ideal. Morning sun with afternoon shade gives the best color and the fewest wilting episodes.
• Prune. This is a reblooming bigleaf hydrangea that flowers on old and new wood, so heavy pruning is rarely needed. Simply remove dead or weak stems and spent blooms; if you want to shape it, do so right after the first flush of flowers to protect the buds already set for next year.
• Mulch & winter care. Maintain a steady mulch layer to hold moisture and insulate roots. In colder parts of the range, a deeper layer of mulch over the crown in late fall helps protect old-wood flower buds through winter.
• Pests & disease. Generally trouble-free. Watch for aphids and spider mites in hot, dry spells, and powdery mildew or leaf spot where airflow is poor — space plants well and avoid wetting the foliage late in the day.
• Bloom tips. To shift color, lower soil pH with aluminum sulfate or elemental sulfur for blue, or raise it with garden lime for pink. Deadheading spent mopheads keeps the plant tidy and encourages continued rebloom.

When does it bloom and for how long?

Grin and Tonic™ begins flowering in late spring to early summer and reblooms steadily into fall. Because it sets buds on both old and new wood, you get continuous waves of mophead flowers rather than one short early season.

How do I get blue flowers instead of pink?

Bloom color is controlled by soil pH, which affects how much aluminum the plant can take up. Acidic soil (lower pH) gives blue flowers, alkaline soil (higher pH) gives pink, and in-between soils produce purple and pastel blends. Add aluminum sulfate or elemental sulfur for blue, or garden lime for pink, and reapply seasonally to maintain the color.

Why isn't my hydrangea blooming?

The most common cause with bigleaf hydrangeas is pruning at the wrong time and cutting off buds. Although this reblooming type flowers on new wood too, heavy late pruning still reduces the display. Other causes are too much shade, a late frost damaging old-wood buds, or excess nitrogen fertilizer that favors leaves over flowers.

When and how should I prune it?

Little pruning is needed. Remove dead or damaged stems and spent blooms as you see them. If you want to shape the plant, prune right after the main early-summer flush so you don't remove the old-wood buds it has already set for the following year.

Does it need sun or shade?

Part sun is best — ideally morning sun with shade through the hottest part of the afternoon. Too much direct, hot sun causes wilting and washed-out color, while deep shade reduces flowering.

Can I grow it in a container or as a low hedge?

Yes. Its compact 2-to-3-foot size makes it well suited to large patio containers and to low informal hedges or massed borders. In containers, use a quality potting mix, water consistently, and in colder zones give the pot some winter protection since roots are more exposed than in the ground.