Made growing plants require the same surfaces under them as are needed to

spawn, so plants places on e.g. cobble or a flower poit don't change.

README~

@@ -1,60 +0,0 @@
---- README for Flowers:
-
-This is a mostly-rewrite of Ironzorg's flowers mod, using more recent features 
-in the game, to make the code perform better.
-
-Dependencies: none (just the game's default stuff)
-
-License:  cc-by-sa 3.0 for the textures, WTFPL for everything else.
-
---- README for Jungle Grass:
-
-Since recent versions of Minetest no longer contain jungle biomes, and 
-hence no jungle grass, I created this mod to re-add said grass back into 
-the game, with a twist: There are now four different sizes of grasses, 
-all of which yield a single junglegrass object when gathered (so all 
-four sizes may be used where jungle grass is called for).  The largest 
-size uses the game's standard jungle grass node, while the others are 
-defined by this mod.
-
-Junglegrass will spawn on dirt, grass, sand, desert sand and the tops of 
-papyrus and cactus (though rarely), and will do so anywhere in the map.  
-Grass on the ground will grow and eventually die (or turn into dry 
-shrubs, in the desert), given enough time.
-
-Adjusting the overall spawn/growth rate is easily done by tweaking the 
-MAX_RATIO variable at the top of init.lua.  A larger value results in 
-less frequent events.
-
-Dependencies: none (just the game's default stuff)
-
-License:  cc-by-sa 3.0 for the textures, WTFPL for everything else.
-
---- README for Poison Ivy:
-
-This is a mod for minetest and its forks to add poison ivy.
-
-Ivy will spawn on dirt or grass, and in some cases, on vertical 
-surfaces, trees, and jungle trees where they meet the dirt or grass.  
-Ivy previously spawned will occasionally grow taller/thicker or start 
-climbing up said vertical surfaces and trees.
-
-At present, the plants present little more than an annoyance - they can 
-only be cut down and either re-planted or thrown away.  No damage is 
-done by harvesting them, yet. ;-)
-
-Mod based on ironzorg's flowers mod; I left the spawn rates the same so 
-the plants don't take over your world (in fact, they may take a few 
-day/night cycles before you start to notice them).  If you want a really 
-overgrown environment just lower the MAX_RATIO and GROWING_DELAY 
-variables at the top of init.lua.
-
-Textures hand-drawn by me (16x16px).
-
-License: WTFPL (applies to all parts)
-
-Depends: None.
-
-No crafting recipes (didn't see a point :-) ).
-
-

plants/init.lua

@@ -129,7 +129,7 @@ end
 
 -- The growing ABM
 
-grow_plants = function(gdelay, gchance, gplant, gresult, dry_early_node, dont_grow_nodes)
+grow_plants = function(gdelay, gchance, gplant, gresult, dry_early_node, grow_nodes)
 	minetest.register_abm({
 		nodenames = { gplant },
 		interval = gdelay,
@@ -140,18 +140,18 @@ grow_plants = function(gdelay, gchance, gplant, gresult, dry_early_node, dont_gr
 			local n_top = minetest.env:get_node(p_top)
 			local n_bot = minetest.env:get_node(p_bot)
 
-			dbg("abm triggered for "..gplant.." on "..n_bot.name.." at "..dump(pos).." -- checking if its in "..dump(dont_grow_nodes))
+			if string.find(dump(grow_nodes), n_bot.name) ~= nil and n_top.name == "air"
-			if string.find(dump(dont_grow_nodes), n_bot.name) == nil and n_top.name == "air" then
+				and (n_bot.name == "default:dirt_with_grass" 
-			dbg("It wasn't, and it has air above it.")
+					or n_bot.name == "default:sand" 
+					or n_bot.name == "default:desert_sand")
+			then
 				-- corner case for changing short junglegrass to dry shrub in desert
 				if (n_bot.name == dry_early_node) and (gplant == "junglegrass:short") then
 					gresult = "default:dry_shrub"
-					dbg("Want to change "..gplant.." to "..gresult)
 				end
 
 				-- corner case for wall-climbing poison ivy
 				if gplant == "poisonivy:climbing" then
-					dbg("Want to grow "..gplant)
 					local walldir=plant_valid_wall(p_top)
 					if walldir ~= nil then
 						dbg("Grow: "..gplant.." upwards to ("..dump(p_top)..")")
@@ -247,7 +247,7 @@ if enable_flowers then
 			}
 		})
 
-		spawn_on_surfaces(delay, "flowers:flower_"..flower, radius, chance, "default:dirt_with_grass", {"group:flower"}, flowers_seed_diff)
+		spawn_on_surfaces(delay, "flowers:flower_"..flower, radius, chance, "default:dirt_with_grass", {"group:flower", "group:poisonivy"}, flowers_seed_diff)
 	end
 
 	minetest.register_node(":flowers:flower_waterlily", {
@@ -386,7 +386,7 @@ if enable_junglegrass then
 	spawn_on_surfaces(spawn_delay*2, "junglegrass:shortest", 4, spawn_chance/10, "default:desert_sand"    , {"group:junglegrass", "default:junglegrass", "default:dry_shrub"}, junglegrass_seed_diff, 5)
 
 	for i in ipairs(grasses_list) do
-		grow_plants(grow_delay, grow_chance/2, grasses_list[i][1], grasses_list[i][2], "default:desert_sand", {"default:cactus", "default:papyrus"})
+		grow_plants(grow_delay, grow_chance/2, grasses_list[i][1], grasses_list[i][2], "default:desert_sand", {"default:dirt_with_grass", "default:sand", "default:desert_sand"})
 	end		
 end
 
@@ -441,8 +441,8 @@ if enable_poisonivy then
 	})
 
 	spawn_on_surfaces(spawn_delay, "poisonivy:seedling", 10 , spawn_chance/10, "default:dirt_with_grass", {"group:poisonivy","group:flower"}, poisonivy_seed_diff, 7)
-	grow_plants(spawn_delay, grow_chance, "poisonivy:seedling", "poisonivy:sproutling")
+	grow_plants(spawn_delay, grow_chance,   "poisonivy:seedling", "poisonivy:sproutling", nil, {"default:dirt_with_grass"})
-	grow_plants(spawn_delay, grow_chance*2, "poisonivy:climbing")
+	grow_plants(spawn_delay, grow_chance*2, "poisonivy:climbing", nil,                    nil, nil)
 end
 
 print(loadstr..")")

plants/init.lua~

@@ -18,7 +18,7 @@ local enable_flowers = true
 local enable_junglegrass = true
 local enable_poisonivy = true
 
-local plantlife_debug = true
+local plantlife_debug = false
 
 local plantlife_seed_diff = 123
 local perlin_octaves = 3
@@ -129,7 +129,7 @@ end
 
 -- The growing ABM
 
-grow_plants = function(gdelay, gchance, gplant, gresult, dry_early_node, dont_grow_nodes)
+grow_plants = function(gdelay, gchance, gplant, gresult, dry_early_node, grow_nodes)
 	minetest.register_abm({
 		nodenames = { gplant },
 		interval = gdelay,
@@ -140,18 +140,18 @@ grow_plants = function(gdelay, gchance, gplant, gresult, dry_early_node, dont_gr
 			local n_top = minetest.env:get_node(p_top)
 			local n_bot = minetest.env:get_node(p_bot)
 
-			dbg("abm triggered for "..gplant.." on "..n_bot.name.." at "..dump(pos).." -- checking if its in "..dump(dont_grow_nodes))
+			if string.find(dump(grow_nodes), n_bot.name) ~= nil and n_top.name == "air"
-			if string.find(dump(dont_grow_nodes), n_bot.name) == nil and n_top.name == "air" then
+				and (n_bot.name == "default:dirt_with_grass" 
-			dbg("It wasn't, and it has air above it.")
+					or n_bot.name == "default:sand" 
+					or n_bot.name == "default:desert_sand")
+			then
 				-- corner case for changing short junglegrass to dry shrub in desert
 				if (n_bot.name == dry_early_node) and (gplant == "junglegrass:short") then
 					gresult = "default:dry_shrub"
-					dbg("Want to change "..gplant.." to "..gresult)
 				end
 
 				-- corner case for wall-climbing poison ivy
 				if gplant == "poisonivy:climbing" then
-					dbg("Want to grow "..gplant)
 					local walldir=plant_valid_wall(p_top)
 					if walldir ~= nil then
 						dbg("Grow: "..gplant.." upwards to ("..dump(p_top)..")")
@@ -247,7 +247,7 @@ if enable_flowers then
 			}
 		})
 
-		spawn_on_surfaces(delay, "flowers:flower_"..flower, radius, chance, "default:dirt_with_grass", {"group:flower"}, flowers_seed_diff)
+		spawn_on_surfaces(delay, "flowers:flower_"..flower, radius, chance, "default:dirt_with_grass", {"group:flower", "group:poisonivy"}, flowers_seed_diff)
 	end
 
 	minetest.register_node(":flowers:flower_waterlily", {
@@ -386,7 +386,7 @@ if enable_junglegrass then
 	spawn_on_surfaces(spawn_delay*2, "junglegrass:shortest", 4, spawn_chance/10, "default:desert_sand"    , {"group:junglegrass", "default:junglegrass", "default:dry_shrub"}, junglegrass_seed_diff, 5)
 
 	for i in ipairs(grasses_list) do
-		grow_plants(grow_delay, grow_chance/2, grasses_list[i][1], grasses_list[i][2], "default:desert_sand", {"default:cactus", "default:papyrus"})
+		grow_plants(grow_delay, grow_chance/2, grasses_list[i][1], grasses_list[i][2], "default:desert_sand", {"default:dirt_with_grass", "default:sand", "default:desert_sand"})
 	end		
 end
 
@@ -441,8 +441,8 @@ if enable_poisonivy then
 	})
 
 	spawn_on_surfaces(spawn_delay, "poisonivy:seedling", 10 , spawn_chance/10, "default:dirt_with_grass", {"group:poisonivy","group:flower"}, poisonivy_seed_diff, 7)
-	grow_plants(spawn_delay, grow_chance, "poisonivy:seedling", "poisonivy:sproutling")
+	grow_plants(spawn_delay, grow_chance,   "poisonivy:seedling", "poisonivy:sproutling", nil, {"default:dirt_with_grass"})
-	grow_plants(spawn_delay, grow_chance*2, "poisonivy:climbing")
+	grow_plants(spawn_delay, grow_chance*2, "poisonivy:climbing", nil,                    nil, nil)
 end
 
 print(loadstr..")")