Quick answer: Planting Trees in Beach Sand — A stump is the part of the problem that is still in the ground: it holds the roots that lift pavement, keeps a species alive if it re-sprouts, and occupies the spot where the next planting goes. Grinding removes it below the surface so the ground can be worked again, and the roots that matter are the ones under the driveway rather than the ones beside the trunk.
Field note. On this coast the stump is rarely the end of the job: Monterey pine and eucalyptus both keep enough energy in the roots to push new growth, so we are looking at the species before we quote the grind rather than after.
On the other hand, a stump left in a garden bed is sometimes the better answer — it decays, feeds the soil and costs nothing — so grinding is a choice, not a rule.
Beach sand is the best-drained soil on the coast right up until the moment someone digs a hole in it. Then it becomes the worst-drained, and the tree that goes into the hole is being planted into a bathtub with a lid on it.
Why the hole fills
Water moves down through sand quickly because the pores between grains are large and connected. At the wall of a dug hole the structure is different: the sand has been compacted and smeared by the shovel, and the pore network is broken. Water arriving from above reaches that boundary, slows, and accumulates. The hole fills, the root ball sits in it, and on a winter night after three inches of rain the tree is standing in water.
The same thing happens at the bottom, where the organic matter of a nursery root ball meets raw sand. Fine-textured material over coarse material holds water at the interface the way a sponge holds water on a counter. The root ball is the sponge.
The fix is not to dig deeper or to add gravel, both of which make it worse by creating a larger reservoir. It is to plant shallow, in a wide, saucer-shaped depression rather than a pit, and to leave the sides of the hole rough rather than smeared.
The flare problem is worse here
A buried root flare kills trees slowly everywhere, but on sand it happens faster because the tree is also being asked to grow in a medium with almost no nutrient-holding capacity. A tree planted two inches too deep in clay declines over a decade. The same tree in sand can go in three years, and the symptom — a thin crown, a trunk that does not taper — looks like drought and is treated as drought.
The flare must be visible at the finished grade. On a beach lot the finished grade moves, so the flare should start slightly high and be checked each spring after the winter wind has rearranged the surface.
Salt is in two places
Salt on the foliage is the one people see: burn on the windward edge, browning that starts at the leaf margin and works inward. Salt in the soil is the one that kills, and it accumulates because there is very little clay or organic matter to hold cations and very little rain to flush them through coarse sand. A plant that shrugs off spray can still be poisoned by the root zone.
The countermeasure is drainage and fresh water, in that order. A beach planting that ponds will concentrate salt exactly where the roots are.
What actually grows here
Species that expect sand and wind: Monterey cypress, shore pine, the native dune grasses for groundcover, sand verbena, beach sagewort, and the low ceanothus from the bluffs. These are not compromises. They are the plants that were here before the lots were subdivided, and they are the only ones that will still be here when the wind has had a decade to work on the alternatives.
Do not amend the whole bed. Amend the backfill in the planting hole, water the root ball for three summers, and let the roots find the native sand. A tree that establishes in amended soil and then has to grow into raw sand has a boundary to cross, and the crossing is where it fails.
Where a lot drains badly despite all this, the problem has moved from horticulture to grade, which is drainage and grading rather than planting.