How to Plant a Grace Ward Lithodora

When and where to plant

Grace Ward Lithodora is hardy in zones 6 through 8 and grows best in full sun, six or more hours of direct light each day. In hotter southern zones, a little afternoon shade keeps the foliage from scorching, but anything less than four hours of sun and the plant trades blue flowers for thin sparse growth.

Spring is the planting window in most of the country, after the last hard frost but before summer heat sets in. Early fall planting works in zones 7 and 8 if you can get six weeks of root growth before the ground freezes.

The site has to drain fast. Grace Ward Lithodora comes from rocky Mediterranean hillsides and rots in heavy wet ground, especially in winter. Acidic soil between pH 5.5 and 6.5 is the other non-negotiable, since alkaline soil locks up iron and turns the foliage yellow within a season. On clay or near concrete foundations where the soil runs alkaline, plant on a 4 to 6 inch raised mound of native soil amended with compost and grit.

Space plants 12 to 18 inches apart so the mat knits together by the end of year two without crowding the crowns.

Planting a container-grown nursery plant

The single most important rule for Grace Ward Lithodora is drainage. The crown, where the stems emerge from the roots, must sit at or just above the finished soil surface, never buried, and the soil underneath has to shed water fast. Plants that sit in winter wet rot at the crown and rarely recover, even when everything above ground looks fine in fall.

1. 1
   Pick a cool overcast planting day Aim for a mild spring day after the last hard frost has passed, ideally cool and overcast. Hot sunny weather pulls moisture out of freshly transplanted foliage faster than new roots can replace it. If you can only plant on a warm day, do it in the early morning and water in immediately.
2. 2
   Dig the hole twice as wide Measure the nursery root ball, then dig a hole twice as wide and the same depth, not deeper. A wide hole loosens the soil so the shallow lateral roots can push out into native ground. On heavy clay or near a foundation where soil runs alkaline, mix a few handfuls of compost and coarse grit or pumice into the backfill so water moves through quickly.
3. 3
   Set the crown at or just above grade Slide the plant out of its pot and look at where the stems meet the roots, which is the crown. Position the plant in the hole so the crown sits at or just above the surrounding soil level, never below it. On poorly drained ground, plant on a low mound 4 to 6 inches above grade so winter water drains away from the crown rather than pooling around it.
4. 4
   Backfill, water in deeply, and mulch Hold the plant upright as you backfill with the same native soil you removed, firming gently to remove large air pockets without packing the soil hard. Water the planting hole slowly until the soil settles around the roots, then top with one to two inches of fine bark or pine needle mulch, keeping the mulch pulled back an inch from the crown. Mulch piled against the crown holds moisture against living tissue and invites the rot the drainage rule is meant to prevent.

The first year

The first year for a newly planted Grace Ward Lithodora is mostly about getting roots into the native soil and a single spreading layer of evergreen stems established. The plant will not look like the dense blue-flowered mat in the catalog photo until year two at the earliest, and that is normal.

The most common new-grower mistake is reading slow above-ground growth as a sign of trouble and overwatering or adding fertilizer. Both can kill the plant. Soggy roots cause the crown rot the species is most vulnerable to, and fertilizer pushes leafy growth before the root system is ready and burns the surface roots. Stick to deep weekly watering through the first summer and skip the fertilizer entirely in year one.

Healthy first-year growth looks like a steady evergreen mat that holds its dark green color, with a small handful of brilliant deep-blue flowers in late spring or early summer if conditions are right.

What can go wrong

1. Mushy crown or sudden collapse

   Crown rot from wet soil is the most common cause of failure for this plant, especially over winter on heavy ground. Check whether the crown is sitting at or below the soil line and whether water is pooling around the plant after rain. If the crown is buried or the ground stays saturated, lift the plant and replant on a 4 to 6 inch raised mound amended with grit. Going forward, water based on whether the soil feels dry an inch down rather than on a fixed schedule.

2. Yellow leaves with green veins

   Alkaline soil is locking up iron, a condition called chlorosis that shows up first on the newest growth. Test the soil pH and aim to bring it into the 5.5 to 6.5 range. Top-dress with elemental sulfur or pine needle mulch to acidify gradually, or for a faster fix apply a chelated iron drench formulated for acid-loving plants. Avoid planting near concrete foundations or sidewalks where lime leaches into the soil.

3. Browning stems in late winter

   Cold dry winter wind pulls moisture from the evergreen foliage faster than frozen roots can replace it, leaving rusty brown patches by early spring. In zones 6 and the colder edge of 7, water deeply right before the ground freezes hard in late fall and lay an inch of light evergreen-bough cover over the plant once the ground is frozen. Trim out dead stems in mid-spring once you can see fresh green growth pushing from underneath.

4. Few or no blue flowers

   Too little sun is almost always the cause. Grace Ward Lithodora needs six or more hours of direct light to bloom heavily, and anything under four hours produces thin growth with only a scattered handful of flowers. Move the plant to a sunnier site in early spring or fall, or thin overhead branches if a tree or structure has gradually shaded the bed. Avoid nitrogen-heavy fertilizer, which pushes foliage at the expense of flowers.

5. Wilting and drought stress in year one

   Even drought-tolerant Mediterranean plants need consistent water through their first summer while roots are still shallow. Water deeply once a week, soaking the soil 6 inches down, and let the surface dry between sessions. If a heat wave hits, water early in the morning and rig temporary shade cloth through the hottest afternoon hours. Drought-tolerance kicks in once the plant has rooted out beyond the original planting hole, usually by year two.

6. Plants pushed up out of the ground after winter

   Frost heave happens on heavy wet ground when freeze-thaw cycles physically lift small shallow-rooted plants out of the soil. Check newly planted Grace Ward Lithodora in early spring and press any heaved plants firmly back into place while the soil is still soft. A 1 to 2 inch mulch layer applied after the ground freezes hard buffers the soil temperature and prevents most heaving in future winters.

7. Slow lateral spread in year one

   This is normal. Grace Ward Lithodora puts most of its first-year energy into roots, and a healthy newly planted mat typically only extends an inch or two of new lateral growth in year one. If the stems are dark green and the crown is firm, the plant is doing what it should, and the spread picks up sharply in year two as the root system fills in. Resist the urge to fertilize, which trades long-term root depth for short-term shoot growth.

8. Bleached patches on south-facing stems

   Hot afternoon sun on dark green evergreen foliage can scald the surface tissue in zones 7 and 8, especially during heat waves in the first summer. Provide a few hours of light afternoon shade, either from a taller neighboring plant or temporary shade cloth, until the plant is fully established. The bleached tissue won't recover but new growth from underneath will replace it through the following season.