The temperature-activated feeding sticks release nutrients only when plants need them most at or above 50° F. Once … Laguna Once-A- Year Fertilizer Spike, Aquatic Plant Laguna Plant Grow Mini Fertilizer Pond Spikes supply important nutrition to aquatic plants for a period of up to one year. The Plant Grow Fertilizer Pond Spikes are specifically designed for potted plants and are compatible with all planting baskets. 4.0 average based on 2 … Other sizes available:-PT909 Laguna Plant Grow Fertilizer Pond Spikes, bulk 50-pack-PT910 Laguna Plant Grow Fertilizer … Other sizes available: – Laguna Plant Grow Fertilizer Pond Spikes, bulk 50-pack (PT909) – Laguna Plant Grow Mini Fertilizer … 6-pack. 3-pack. Bulk 50-pack. 2 product ratings. Share - Laguna Once-A-Year Mini Fertilizer Spike, Aquatic Plant 6-Pack. Out of Stock Laguna Plant Grow Once-A-Year Fertilizer Pond Spikes supply important nutrition to aquatic plants for one full year. Other sizes available: – Laguna Plant Grow Fertilizer Pond Spikes, 7 in, 3-pack (PT910) – Laguna Plant Grow Mini Fertilizer … Length of spike: 10 cm (4 in). Length of spike: 7 in. The temperature-activated feeding sticks release nutrients only when plants … The Plant Grow Mini Fertilizer Pond Spikes are specifically designed for potted plants and are compatible with all planting baskets. Length of spike: 7 in. The Plant Grow Fertilizer Pond Spikes are specifically designed for potted plants and are compatible with all planting baskets. CURRENTLY SOLD OUT. Laguna Once-A-Year Mini Fertilizer Spike, Aquatic Plant 6-Pack.