I’ve had these 2 small niwaki JBPs since Dec 2018.
They were originally bought in 15gal pots, and are 4-5’ tall.
I re-potted them into large 28” wide oak wine barrels in Feb 2019; so, they’ve been in them for almost 2 years now.
I am not sure it the roots have filled up the entire barrel yet. So, the rootball may still be smaller than the large barrel/pot. Irdk. Hoping the rootballs are a little smaller though, so it’s easier to dig and plant.
Anyways, I’ve originally always been wanting to plant them into the ground (as niwaki).
I actually attempted to do this in Jan 2019; but I saw the main water supply pipe to the house, as I was digging the hole. Hence, why I put them into wine barrels instead; as I was unsure if it was safe to plant it above the main water supply pipe/line.
As you can see, the location is in a perfect area for a nice specimen tree/niwaki. But, the main water pipe is 20” right below in the middle (BLUE dotted line).
The main question is:
Is it safe and okay to plant a JBP above this water line??
Maybe with some kinda barrier to deflect the roots away? (I have several spare 1x1’ and also 2x2’ granite tiles)
I walked around the neighborhood to see other plant placements, and I def see that some neighbors (not all though), have pigmy date palms and large 20-30’ fan palms right above their main water supply line.
Also, my old, tall, upright eugenia (with maybe an 8” trunk and 30yo… it’s been there since the house was built) is also right above the main water supply line (RED arrow).
I did some Googling, and read about some trees to Avoid and also ones that are Suitable for planting over or close-to water pipes.
But, I couldn’t find anything for JBP, or even San Jose Juniper (I have an old potted SJ juniper too, and 11 cuttings/air-layers from it).
Here’s what I found:
Trees with aggressive roots and fast-growing trees:
Silver maple, poplars, rubber trees, ashes, Modesto ash, sycamore, oaks, willows, basswood, tuliptree, elms, birches, mulberry, figs, eucalyptus, beeches, black walnut, magnolia, holly shrubs, ivy.
Small deciduous trees, slow growing, non-aggressive or shallow roots:
Japanese maple, ilex, carolina buckthorn, quince, wintersweet, acoma crape myrtle, crabapple, hoptree, stewartia, weeping higan, Jolivette cherry, eastern redbud, dwarf dogwood, ginko
Small, slow growing evergreen, under 20’ max height:
Boxwood tree, Hurd manzanita, tea-oil, yennan camelia, Mediterranean fan palm, akupuka, variegatum Japanese privet, some osmanthus, photinia, cabbage palm, Awabuki sweet viburnum, weeping blue atlas cedar, Chinese & Japanese plum yews, fernspray cypress, slender hinoki cypress.
No mention of Japanese Black Pine though from the “Suitable” lists I am researching.
Is planting a JBP safe there?
What about a SJ Juniper as a possible alternative? (I really want a JBP there though!)
Any help greatly appreciated!