Create a moat around the plant with vertical tunnels. Scoria is a mafic volcanic glass. Then we would spend a whole day dragging the wood chips to the garden. Then spread them evenly over the garden with the tractor. They finished at about 12" wide. Can I use scoria and pumice? Usually, we spend our fall doing all kinds of chores, and one of our biggest chores was securing our wood chips and getting them delivered. The moat should be at least a foot (30 cm.) Streak of rock is the color of powder produced when it is dragged across an unweathered surface. Pumice and scoria are both volcanic rocks made from rapidly cooling erupted lava. The types of Scoria are Not Available whereas types of Pumice are Scoria. As nouns the difference between scoria and pumice is that scoria is the slag or dross that remains after the smelting of metal from an ore while pumice is a light, porous type of pyroclastic igneous rock, formed during explosive volcanic eruptions when liquid lava is ejected into the air as a froth containing masses of gas bubbles as the lava solidifies, the bubbles are frozen into the rock. each with 6 #10 can scoops of scoria inside and stapled shut. Close examination of fresh pumice shows its glassy nature. The types of Pumice are Scoria whereas types of Scoria are Not Available. Properties of rock is another aspect for Scoria vs Pumice. Streak of rock is the color of powder produced when it is dragged across an unweathered surface. The streak of Pumice and Scoria is white, greenish white or grey. Properties of rock is another aspect for Pumice vs Scoria. In laboratory trials scoria has consistently shown excellent results with a range of crops such as tomatoes, capsicums, beans, flower crops and herbs. The scoria we ordered was 3/4" and it was like shoveling Fruity Pebbles after the gravel for the first two rows. Funnel pumice into the vertical holes. This again is only for stock plants, as there is no control over the growth in such a mix, plants will just push hard. (Some bags were larger and some smaller.) Scoria/Lava Rock - aeration. For stock plants growing really hard you could try 100% pumice. Image via Shutterstock. For potted succulents, combine equal portions of pumice to potting soil. away from the base of the plant. Pumice and scoria are vesicular forms of igneous rock. Pumice and scoria are differentiated by density alone - pumice is less dense than water and scoria is more dense. The 15" x 25" bags weighed about 25-30 lbs. The hardness of Pumice is 6 and that of Scoria is 5-6. The various types of igneous rocks, once molten rock, have all since cooled into their current solid forms.Two forms of igneous rocks-- pumice and volcanic scoria -- are known as vesicular types which formed on lava flow surfaces.. Igneous Rocks. The main issue with scoria is that, depending on the formation, you will see different properties. The holes are formed when the lava quenches with trapped gas bubbles inside. Pumice is a felsic volcanic glass. Scoria is formed when frothy lava is thrown high into the air during a volcanic eruption and then cools on the way down. It … It is an extremely vesicular basaltic lava with very small (< 1mm) vesicles. Some will be denser and less porous which means it won't aerate as well. Pumice can be used as a topdressing to absorb rainwater that puddles around plants. Pumice - This is the ideal medium for a proper H2O and O2 balance. It is rock foam with so much air in its structure that it often floats on water. Scoria and Pumice. 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