Allium fistulosum
Welsh onion (Allium fistulosum) is a ruderal bulb in Supplant — a native buffer and invasive attacker whose game role is set out below.
The Welsh onion (scallion) is a clump-forming culinary allium. In battle it is a Bulb — a Ruderal on the succession chart. Native across East Asia, it plays as a defensive buffer; where it has spread as an invasive into Africa, Europe, eastern North America, western North America, Oceania, South America and South Asia, it turns attacker.
Its starter attack, Double Nose, is available from Lv 1 for 2 Sun and deals about 44 damage as a native and 52 as an invasive. The free once-per-battle ability, Naturalized Sward, unlocks at Lv 25: Spreads through the whole meadow — the foe's bench withers. The advanced attack, Spring Burst (Lv 40, 6 Sun), hits for about 48 native and 52 invasive.
From Lv 10 it carries Spring Ephemeral Burst, +4 SPD for the first two turns before it eases off. At Lv 68 a second always-on trait stacks on: Contractile Pull, whose DEF climbs by 1 each checkup up to +5 across the fight.
For field gear, a Calcium/Magnesium amendment adds flat DEF, which a soft-bodied plant like this feels most; feeding it Nitrogen (N), the nutrient matching its edible leaf, pays bonus coins. Its growth habit is not recorded as a climber, so it is not Moss Pole–eligible.
Read at the snapshot level (Lv 40, where its whole kit is unlocked), it shows 103 HP and 16 ATK as a native, or 89 HP and 27 ATK as an invasive, with 2 DEF. As a native it adds a 15% HP cushion and, while benched, projects an HP overshield onto your active; as an invasive it trades that for the higher attack ceiling and pays Faustian self-damage to its own bench on every damaging attack, conceding 2 prizes when it is knocked out. On defence, its DEF stays near the floor, so it relies on tempo and offence rather than soaking hits. Its opening tempo (turn 1) is 31 and its sustained tempo (turn 2 onward) 34 — making it steady in both the opening and the sustained phases of a fight. Retreating it costs 16 Sun. See Stats and Native Strength for the full picture.
By Lv 100 its HP swells toward 190, but its DEF barely leaves its band at 3 — a soft-category plant stays soft no matter how much biomass it puts on. Attack reaches 28, retreat rises to 33 Sun, and its inverted tempo has sunk to a sliver, so the speed it relied on young is spent. It grows bulkier but never becomes a wall.
On the succession chart a Bulb is a Ruderal. Ruderal plants hit Specialist categories hard (×1.5) and are resisted by Competitor categories (×0.667); against everything else the matchup is neutral. Weird categories are off the wheel entirely, so it trades neutrally with those.
A near-global invader with strong attacks — its advanced blow is one of the biggest here — a fast Speed burst up front, and DEF that builds over the fight. Leaf-edible for coins. Soft early, but a strong invasive coin-earner. Because its edible part (leaf) is recorded, feeding it Nitrogen pays ×1.25 coins; any other nutrient banks ×1.25 XP instead.
It fights as a fast skirmisher until about Lv 25 (a little later as an invasive, around Lv 26), after which its growing bulk and attack take over from its early speed edge.
Leveling trades speed for power. A plant’s tempo (SPD + INI, the turn-order edge) fades as it grows, while its power (HP + ATK + DEF, net of the rising Sun cost to retreat) climbs. The crossover is the level where power overtakes tempo: below it the plant is a fast skirmisher, above it a heavyweight. Shown for each stance this plant can actually hold — native adds a HP cushion, invasive an attack edge, neutral neither — with the card at its crossover and fully grown at Lv 100.