When I try to load this up with the Quality Seeds mod, I get the following error:

Failed to load mods: Error while loading recipe prototype "gmo-tree-plant-pine" (recipe): Key "icon" not found in property tree at ROOT.recipe.gmo-tree-plant-pine.icons[4]
Modifications: Quality Seeds

Hey, thanks for reporting.

Mod is actively developed due to alien biomes compatibility, so for the time being, I added it to the incompatibility list for next update 0.1.6
This way I won't forget about the conflict and don't cause crashes.

I might have identified the problem source.

qualityseeds.lua creates gmo recipes, and assumes 'icon' property, while my mod uses the 'icons' property since sometimes it has multiple layers.

For example:
local seed_item = {
type = "item",
name = seed_name,
localised_name = { "item-name.alien-tree-seed",
{ "alien-biomes." .. treedata.locale },
{ "alien-biomes." .. model_data.locale } },
icons = {
{ icon = "alien-biomes-graphics/graphics/icons/tree-" .. model_data.type_name .. "-trunk.png", icon_size = 64 },
{ icon = "alien-biomes-graphics/graphics/icons/tree-" .. model_data.type_name .. "-leaves.png", icon_size = 64, tint = treedata.colors[1] },
{ icon = "space-age/graphics/icons/tree-seed.png", icon_size = 64, scale = 0.25, shift = { 6, -6 } }
},

Howdy, creator of Quality Seeds here, I added compatibility for your mod, you can remove the incompatibility.

Furthermore, I added a ignore list, which is by default populated with your plant prototypes such that they don't cause unnecessary bloat ( I don't think people want legendary willow trees haha.

Cheers.

Cheers!
I will remove incompatibility in next release.
The only reason I can imagine for people wanting legendary seeds, is if they would yield legendary wood, but normal tree-seed is perfectly enough for that.

Zen garden 0.1.9 (latest update as of writing) still errors:

Failed to load mods: Error in assignID: recipe with name 'crude-wood-processing' does not exist.

Source: basic-gardening (technology).
Mods to be disabled:
zen-garden (0.1.9)

Hey, thanks for the report!
This was caused by the refactor, I forgot to test all the startup-option combinations.

Please write if there is any other issue.