Spellcasters do not always need to provide the literal materials when casting spells with costless components, that's what pouches and foci are for.
A character can use a component pouch or a spellcasting focus (found in “Equipment”) in place of the components specified for a spell. But if a cost is indicated for a component, a character must have that specific component before he or she can cast the spell.
However, there are a handful of spells that have consumed materials without a cost, such as:
- Globe of Invulnerability (Glass/crystal bead; consumed)
- Snare (25ft of rope; consumed)
- Create Homunculus (Clay, ash, mandrake root; consumed, 1000gp jewel-encrusted dagger)
- Druid Grove (Mistletoe harvested with golden sickle under full moon light; consumed)
and we have the following blurb:
If a spell states that a material component is consumed by the spell, the caster must provide this component for each casting of the spell.
Can a Spell Focus or Component Pouch substitute components with no listed cost if those materials are consumed by the spell?